We love the dedication of Mitch and his team have to developing a community of health and wellness. This is a gym that places well being before everything else! Thank you for being there for our patients!

CrossFit Magni is the best CrossFit gym! I love the coaches and community :)

I joined Magni after visiting for a wod with friends. The members are all friendly and helpful, gym is clean and equipment is all in great shape. Most importantly, the coaches are amazing! They are smart and on top of movement descriptions and instruction. The programming is challenging and different. Thanks for making us feel welcome!!

Amazing coaching staff! This gym is clean, well run and has great vibes for both the competitive and not so competitive athlete.

One of my favorite boxes to go to around the country (and I travel for work, go to a lot of CF boxes). They’re a community turned family, and care about your well being and safety during workouts. I always come back to CF Magni when in the area. 🩷

I’ve been part of the CrossFit Community for 7 years now and with work, travel and moving I’ve been in and out of a lot of different CrossFit affiliates. With that being said, CrossFit Magni is easily one of the most elite affiliates out there. When I say elite, I don’t mean just “CrossFit games elite” I mean elite in the sense that they are able to provide to each and every skill level, age, ab... More

I’ve been part of the CrossFit Community for 7 years now and with work, travel and moving I’ve been in and out of a lot of different CrossFit affiliates. With that being said, CrossFit Magni is easily one of the most elite affiliates out there. When I say elite, I don’t mean just “CrossFit games elite” I mean elite in the sense that they are able to provide to each and every skill level, age, ability and more! Whether you’re a long term athlete, regular gym goer, or brand new to fitness as a whole! The knowledge they obtain is top tier and makes you feel very safe and comfortable in these high intensity workouts. Making you stronger, healthier and happier, CrossFit Magni is the fitness place to be in Boise!! Less

CrossFit Magni has the best community around! The coaches are knowledgeable, attentive, encouraging, and dedicated to helping all the members achieve their goals and Mitch has built a community that does the same. Easily the best hour of my day, even when it’s hard!

CrossFit Magni has it all. Great community, top-notch coaches, and they make fitness FUN! The coaches here are dedicated to making sure you get a great workout at the level you are at and making sure you do so in a safe way. The attention to making sure people move well so they can avoid injury and keep doing the things they love doing is only one of the many great things about this place and why... More

CrossFit Magni has it all. Great community, top-notch coaches, and they make fitness FUN! The coaches here are dedicated to making sure you get a great workout at the level you are at and making sure you do so in a safe way. The attention to making sure people move well so they can avoid injury and keep doing the things they love doing is only one of the many great things about this place and why I've kept coming back for the past almost 5 years. If you're looking for a great local CrossFit gym, give them a try! Less

Great set of coaches here and a good set of members. They are able to approach each person's goals and abilities within the programming each week.

Great gym! Since I joined I’ve gained muscle and energy for my day. It’s made it easy to get up in the mornings and helped build a routine. Great coaches and community!

Mitch and his staff of coaches are amazing! I was challenged, supported, and befriended! I love Mitch's approach to fitness and am in aw of his knowledge. This community is positive, fun, engaging, and encouraging. I love having one on one coaching in a group atmosphere - it really is the best combination for growth!

The best gym in town. Mitch and gang will modify all of the workouts and movements to each individual to build up to doing the movement correctly. I have many joint and mobility issues, so I get customized workouts to prevent injuries and to build strength. The members are like family and most of all we have FUN!

As a beginner to crossfit I highly recommend Magni. Coaches do a great job at making you fit right in! A very encouraging group of members make it a fun and encouraging environment!!!

CrossFit Magni has helped me tremendously with my overall lifestyle goals. And these are goals that I can sustain for the rest of my life....ideally :) I have become more consistent with my workouts (because I enjoy coming to class) and I am taking my nutrition goals more seriously. I started in April of last year and have seen significant changes. Just in the past 4 months, I have increased ... More

CrossFit Magni has helped me tremendously with my overall lifestyle goals. And these are goals that I can sustain for the rest of my life....ideally :) I have become more consistent with my workouts (because I enjoy coming to class) and I am taking my nutrition goals more seriously. I started in April of last year and have seen significant changes. Just in the past 4 months, I have increased muscle mass by 4lbs and decreased my body fat % by 3%. The coaches are all great and have worked with me on my specific goals/scaled workouts. I have never felt judged only encouraged. Such a great community - highly highly recommend AT least giving them a try. You'll never know until you TRY! Less

Mitch is a great coach that really knows his stuff when it comes to working with people of all fitness levels. Magni is a place where all fitness levels can feel welcomed and coached to their specific needs. Great community, great coaches.

I have been a member of CrossFit Magni the past 7 months and it has changed my life for the better. The coaches are fanastic and the community is even better. I wish I would have joined sooner.

This is the best gym I have ever attended and I am so happy to be apart of Crossfit Magi. They are so welcoming at ANY level and the coaches are great at what they do. I would 10000% recommend this gym to anyone.

CrossFit Magni offers a great, warm and welcoming community and a chill CrossFit atmosphere. All skills and abilities are welcome with kind and attentive coaches to help meet your fitness goals.

CrossFit Magni is the perfect gym for anyone looking to get started in CrossFit or long time CrossFit athletes looking for an amazing gym culture with coaches that will motivate and challenge you. CrossFit Magni boasts the perfect balance of instructor lead scaling for all levels of physical ability and programming that will challenge the strongest athlete.

Best people to work on your health with! I love my gym family! The coaches are patient and help build up your confidence while teaching functional fitness

Welcoming gym community! The people are great! The coaches are great! The workouts are well thought out and effective!

Mitch and his coaching staff do a great job programming, training and coaching for all levels of CrossFit. The community at Magni is also the best!

Magni has become my community, as well as the place I show up consistently to develop my health and my skills. I appreciate the mindset of our coaches, who drive home the importance of longevity and continuous improvement. There is always room for modification and because of that, I have made more gains than I would have just trying to lift heavy every day.

If you’re looking for a fun, welcoming environment with expert coaching… looking no further than CrossFit Magni! You will be greeted with a great group of people and you definitely won’t regret it! Come check it out.

THE best gym in Idaho. Mitch is a great coach, leader and has created a really special atmosphere. The gym is clean, functional and the gym community is unmatched. I wish I joined sooner.

Coming from a lifestyle where I put work, obligations, and social commitments at the top of my priorities, I was in search of a way to add “me” at the top of that list. From nutritional guidance to body goals, CrossFit Magni has given me the tools necessary for me to put myself at the top. By simply learning the proper way to use your body during these workouts and lift movements, you can be sur... More

Coming from a lifestyle where I put work, obligations, and social commitments at the top of my priorities, I was in search of a way to add “me” at the top of that list. From nutritional guidance to body goals, CrossFit Magni has given me the tools necessary for me to put myself at the top. By simply learning the proper way to use your body during these workouts and lift movements, you can be sure that you’ll use this strength and technique outside of the gym in your daily life. What makes this gym stand out is what it’s about. You’re greeted with friendly smiles and approachable coaches who are always there and willing to help improve your technique. Have an injury and need to modify a workout? No problem! Not a big fan of running? You don’t have to be. There’s always a scaled version for the exercise(s) so you can still put in the hard work within your abilities. Don’t let your physical inabilities or insecurities at this moment hinder your drive to change your life! Whether you’re a beginner or a veteran to CrossFit, CrossFit Magni welcomes all! Less

Had always wanted to try CrossFit but never made the jump (wish I had sooner). Several friends who attend Magni strongly recommended I check it out as the coaches and community is awesome. Having been going ever since, absolutely love it! Learning new skills, challenging myself, meeting new people. Can’t say enough good stuff about this gym. Mitch and the team are rad, patient and great teachers

So, so worth it. That’s the only way I can sum up my experience with CrossFit Magni. I joined to lose some weight, and if that’s all I’d gotten out of the deal I would have called it money well spent. That’s not however, all I got. Not at all. When I started a few months ago I was 47 years old, overweight, sick, exhausted and felt pretty depressed all the time. Mitch and Alex were great. They tau... More

So, so worth it. That’s the only way I can sum up my experience with CrossFit Magni. I joined to lose some weight, and if that’s all I’d gotten out of the deal I would have called it money well spent. That’s not however, all I got. Not at all. When I started a few months ago I was 47 years old, overweight, sick, exhausted and felt pretty depressed all the time. Mitch and Alex were great. They taught me the basics and safely guided me through the workouts until, with time, the results came. Seems strange now, but the weight loss and increased muscle mass are almost ancillary benefits compared to everything else I’ve gotten. I sleep like the dead now and when I wake in the morning I pop right out of bed with no half hour of grogginess like before. I’m killing it at work and my interactions with my family are much improved because I’m less irritable and more involved. It’s like my baseline happiness level throughout the day has been cranked up to where now an average day feels like what used to be my rare good day. In the simplest terms I can think of; I paid a fee to lose weight and got a vastly better life in the bargain. Less

CrossFit Magni is hands down the best gym I’ve ever gone to. The coaches are great and pay attention to form and allow for modifications. Mitch does a great job with an on boarding assessment and ensures a smooth transition into classes. The members are amazing and I felt like I was gifted an instant family! Only good things to say!!

I dropped in for a few classes while I was in town for work and was very impressed with the gym and the staff. Mitch and his coaches were awesome to work with and the gym was clean and all the members were very approachable. I will be going back here when I’m in town again.

Dropped into CrossFit Magni while visiting Boise for business. The staff was amazing, gym was easy to find and was n great condition. I will definitely be a regular “drop in” when visiting Boise. Looking forward to my next trip.

<<Finally got my nutrition on track!>> I have been doing Crossfit for 1 1/2 years now consistently, however, despite putting in a lot of effort 4 times a week I just gained fat and got totally frustrated. It seemed like all the effort is for nothing - on the contrary even - I never had such a high number on the scale and no pants anymore that fit. Luckily I entered the nutrition coaching and fa... More

<<Finally got my nutrition on track!>> I have been doing Crossfit for 1 1/2 years now consistently, however, despite putting in a lot of effort 4 times a week I just gained fat and got totally frustrated. It seemed like all the effort is for nothing - on the contrary even - I never had such a high number on the scale and no pants anymore that fit. Luckily I entered the nutrition coaching and fat loss challenge with Mitch! Not only did this transform my nutrition - it also completely helped me to shift my mindset, set the right goals in line with my values and create good habits to transform myself in a sustainable way. You won't be promised to loose 10 pounds of fat in 4 weeks like other unprofessional and unrealistic weight loss programs - but I can promise you will establish a system that not only helps you to loose weight in a sustainable way - but also gives you a lot of energy to crush your WODs and to boost your health! I had so much fun with all the little challenges and reflection exercises - and I am now seeing clearly how to deal with my nutrition in a way that allows me to become the best version of myself. Thanks Mitch for your continuous support and the great recipes! Less

I first found CrossFit Magni through their Instagram page. When I saw they were offering the Bod Squad challenge I knew I wanted to sign up. It’s been amazing! Mitch is great and really gives helpful and insightful advice. The nutritional suggestions and recipes are delicious! The daily tasks are awesome at helping me stay focused. Also, doing something new every day keeps it feeling fresh and th... More

I first found CrossFit Magni through their Instagram page. When I saw they were offering the Bod Squad challenge I knew I wanted to sign up. It’s been amazing! Mitch is great and really gives helpful and insightful advice. The nutritional suggestions and recipes are delicious! The daily tasks are awesome at helping me stay focused. Also, doing something new every day keeps it feeling fresh and the way they ease you into important habits (like drinking water first thing in the morning!) makes things feel attainable and realistic. I’ve lost weight (body fat!), lost inches, and gained strength during this challenge but most importantly I gained a lot of great habits and an improved mentality when it comes to how I look at fitness. Less

If you are wanting to try CrossFit but are hesitant, go see Mitch at CrossFit Magni! I was looking for a CrossFit gym near me and was nervous about joining. Mitch and all of the coaches are welcoming and genuinely invested in your fitness journey. Go checkout CrossFit Magni!

Amazing coaches and a great community. I cant believe how much I have improved in just a few months. Be it 1x1 or group coaching I’m having a great experience here. I highly recommend this gym.

Mitch and the coaches at Principia make learning the sport of CrossFit fun by focusing on proper movement and great coaching. In the last year I have gotten in the best shape I’ve been in the last 10 years.

Very friendly and helpful staff

I love this gym! The environment is welcoming, the workouts are well thought out, and the coaches are great at modifying movements and tailoring workouts to address your specific needs. Mitch is awesome and truly strives to make your gym experience one of a kind! As a physical therapist and weightlifter, I highly recommend this gym!

Principia is a great gym! Mitch truly cares about getting his members real results and sustaining them. The gym has a lot to offer between crossfit, individual design programming and personal training. There is something for everyone no matter their goals.

The coaches at Principia are knowledgeable and value each individual by modifying workouts as needed. It’s super fun working out in a supportive community each day!

I was looking for an inclusive gym community and full body programming. I love the women I workout with and definitely look forward to the hour a day I spend with them! The workouts are fun and diverse, with something new to target or come in to each day. I am coming off an injury and the programming is modifiable so that I can still participate and get a killer workout. I feel Mitch really list... More

I was looking for an inclusive gym community and full body programming. I love the women I workout with and definitely look forward to the hour a day I spend with them! The workouts are fun and diverse, with something new to target or come in to each day. I am coming off an injury and the programming is modifiable so that I can still participate and get a killer workout. I feel Mitch really listens to his athletes, what they are looking for in a gym, and he creates that. Traveling for a week? There are at home workouts so that you can keep up with your routine. There are social events that are inclusive of the entire family and help put faces to names in other classes. I have tried several gyms in the Treasure Valley area and have a long history of semi professional team sports and crossfit affiliates. Principia Fitness is the gym that met everything I was looking for. I am stoked to have found a new home here. Less

I can not speak highly enough about this gym. Coaching, cleanliness and programming is all dead on. Looking forward to more sweaty days ahead.

First time at a CrossFit gym and it has been nothing but great. Knowledgeable coaches, friendly community and great space to work out. I’ve gained more strength/flexibility than ever before using their program.

I’m new to CrossFit and like others, I was nervous to start. But Principia’s onboarding program is a game changer. The 1x1 coaching I had with Kyle set me up for success. I truly had so much fun while learning so much! Also, like many others I fell off the wagon because.. ya know, life! Mitch the owner, reached out checking in. It didn’t feel pushy, just genuine curiosity and care into what might... More

I’m new to CrossFit and like others, I was nervous to start. But Principia’s onboarding program is a game changer. The 1x1 coaching I had with Kyle set me up for success. I truly had so much fun while learning so much! Also, like many others I fell off the wagon because.. ya know, life! Mitch the owner, reached out checking in. It didn’t feel pushy, just genuine curiosity and care into what might be holding me back. Mitch took the time to set up a 1x1 with me to connect and reignite my fire. I walked away from this session again, learning SO much, and excited to put all the things I learned into practice. Little tweaks that make a big difference. I love the teams focus on always using proper, getting the mechanics down, finding weaknesses and addressing them. Mitch’s knowledge and passion for fitness is contagious. I always have fun when I’m there 10/10! Less

The best coaching and community! Whatever your age, skill level, or goals, Principia has something for you. Go on now, give it a shot!

This is a great community, you want to go to there.

To find a gym with coaches and members that both encourage and motivate you daily is a rarity ! Love this place ! Thank you for providing me all the keys to a successful healthy relationship with fitness

Great coaching and a great community. Principia has made my fitness journey injury free and helped fix the pain I had before I got there. They really make sure you have the tools to be successful.

Thoroughly enjoy getting my glow on at Principia Fitness. I am currently working on my summer bod, it’s an uphill battle considering my affinity with IPA’s but the coaching and community make it an enjoyable battle that’s slowly being won. Thanks for pushing us Mitch!

Been going to the gym for three years, great atmosphere, good coaching, the community is undeniably the best part - inside and out. Wouldn’t trade it for any other place.

This gym has awesome coaches, workouts, and a great community! The coaches are very knowledgeable and helpful and the entire community really wants to see every member succeed!

Awesome coaches and community! No matter if you’re a beginner or an elite athlete, the coaches are knowledgeable and the entire community wants to help you succeed!

Best Gyn , coaches and community

I Hated working out until I found Principia and this community. Everyone is so friendly, and Mitch and his coaches know their stuff! Thanks guys!

I've done drop ins all over the country and a few in Canada. This box is by far one of my favorites! Coaching and team is friendly and welcoming! The programming is solid so prepare for a great workout! 10/5 stars I can't recommend this box enough!

Principia is a place where they prioritize your health. They will give you the guidance, advice, and attention you need to achieve your goals. The coaching staff and community are fun and supportive. If you want somewhere that will push you to reach your goals with your long term health being their priority, then Principia is for you.

Absolutely love the community at Prinicpia! The coaches genuinely care about every member that walks through the door! They take time to show proper form and continue to watch you to make sure you are doing the movement correctly. My family has benefited so much from Mitch and all the coaches. Thank you!

Principia has been so great for me as I’ve struggled with working out consistently in the past. The staff are all so great and encouraging! I’ve been a member now for a couple of years and learned so much while at my own pace. The coaches are dedicated to helping you improve, and they care about your overall health. I would highly recommend Principia to anyone at any ability level!

So many good things.....Knowledgeable trainers and a welcoming community of members and staff made an unplanned and unexpected week long drop in a pleasurable experience. The facility was top notch with ample equipment and lots of space to get a great workout. Coaches were very attentive to form and safety of movements and mobility is important to them. Members personal goals are a priority and t... More

So many good things.....Knowledgeable trainers and a welcoming community of members and staff made an unplanned and unexpected week long drop in a pleasurable experience. The facility was top notch with ample equipment and lots of space to get a great workout. Coaches were very attentive to form and safety of movements and mobility is important to them. Members personal goals are a priority and they care about you meeting those goals with one on one coaching and progress follow up. Less

I signed up with principia crossfit late 2020 wanting a change in appearance, attitude and looking for a push in motivation to start working out again, i found what i was looking for a here. I appreciate my coach/trainer Rocky so much she worked with my weaknesses and made them stronger making sure i was lifting properly and accurately. During my one on one training i gained more confidence in... More

I signed up with principia crossfit late 2020 wanting a change in appearance, attitude and looking for a push in motivation to start working out again, i found what i was looking for a here. I appreciate my coach/trainer Rocky so much she worked with my weaknesses and made them stronger making sure i was lifting properly and accurately. During my one on one training i gained more confidence in my lifting and was experiencing the changes i looked for. if you want to be part of a crossfit family that will support you and work with you and push you to achieve results ! come check it out ! Less

My husband and I were a last minute drop in during our unexpected extended stay in Boise. The workout was great, the members were friendly and the owner was awesome! Great, intentional programming. We will be back!

Principia is great gym/community. Everyone is very supportive and friendly. The coaches are top notch and really know their stuff.

The coaching staff is educated and passionate. They really care about you reaching YOUR goals!

Extremely knowledgeable coaches and welcoming to all skill levels. Highly recommend!

I started coaching at Principia Fitness 3 years ago because I wanted to take my coaching to the next level. I needed someone to push me to advance my abilities through constructive criticism and educational opportunities. I have been able develop my passion of helping others improve their quality of life into a professional career in ways I didn’t think was possible. Principia’s dedication to con... More

I started coaching at Principia Fitness 3 years ago because I wanted to take my coaching to the next level. I needed someone to push me to advance my abilities through constructive criticism and educational opportunities. I have been able develop my passion of helping others improve their quality of life into a professional career in ways I didn’t think was possible. Principia’s dedication to consistent growth benefits their members, coaching staff, and the Treasure Valley community in so many ways and I’ll always be grateful for the opportunity to be a part of the future of health care! Less

Principia has outstanding coaches who care about each individual , both physically and mentally. Being a senior in age they are always taking into account my mobility issues and incorporating scaling options where necessary that allow me to still benefit physically. I highly recommend Principia for all people who are looking for a place that truly cares for everyone that walks through their door... More

Principia has outstanding coaches who care about each individual , both physically and mentally. Being a senior in age they are always taking into account my mobility issues and incorporating scaling options where necessary that allow me to still benefit physically. I highly recommend Principia for all people who are looking for a place that truly cares for everyone that walks through their door! Less

Went from sitting on the couch to joining this gym. Mitch, the owner, is a quality human who truly cares about you no matter what shape you are in. Our introductory meeting scheduled for an hour went almost two because he listens, asks good questions, and is passionate. You won't get burned out coaches, all of them (Jess, Rocky, Bria, Katie) on staff are rock stars - you'll get holistic individua... More

Went from sitting on the couch to joining this gym. Mitch, the owner, is a quality human who truly cares about you no matter what shape you are in. Our introductory meeting scheduled for an hour went almost two because he listens, asks good questions, and is passionate. You won't get burned out coaches, all of them (Jess, Rocky, Bria, Katie) on staff are rock stars - you'll get holistic individual help to make sure you succeed, feel good, and get stronger while having fun. Best decision we have made in a long while, with classes to fit your schedule and intentionality. Worth the $$! Less

Great gym! I love the programming at this gym and the coaching is amazing. Also, has a great community!

Just started CrossFit for the first time in October of 2019. I could not be happier with that decision and this gym. I did one-on-ones which I highly recommend and then joined the normal classes. I was completely out of shape and lazy when I started, but this community has changed my life. Everyone is so encouraging and welcoming and not once did I feel like the new kid. Physically I sleep better... More

Just started CrossFit for the first time in October of 2019. I could not be happier with that decision and this gym. I did one-on-ones which I highly recommend and then joined the normal classes. I was completely out of shape and lazy when I started, but this community has changed my life. Everyone is so encouraging and welcoming and not once did I feel like the new kid. Physically I sleep better, have some much more energy, and am seeing changes in my body. If you’ve always wanted to try CrossFit or want to be part of a community that pushes you to be your best, this is the place!! Less

great coaches and team mates

I've been doing Crossfit since 2012, I have been a part of Crossfit gyms around different states and countries, so I have a pretty good idea what I look for when I join a Crossfit gym. Mind you. Every Crossfit gym has different programming to offer that may suit an individual better than others. However, their well rounded programming, extremely knowledgeable, and overall awesome coaches, make fo... More

I've been doing Crossfit since 2012, I have been a part of Crossfit gyms around different states and countries, so I have a pretty good idea what I look for when I join a Crossfit gym. Mind you. Every Crossfit gym has different programming to offer that may suit an individual better than others. However, their well rounded programming, extremely knowledgeable, and overall awesome coaches, make for an experience you wish you could easily find elsewhere. Not only is this the best part of my day, but Mitch and the rest of the coaches have helped me improve my lifts, endurance, and overall health. On top of it all (as if the aforementioned wasn't enough), ever since my first day, the sense of community this gym radiates is unparalleled to any other gym I've ever been part of. The members, many of whom I've become friends with. Come together alongside the coaches to make this place whole. If you're looking for a great community, great workouts, and to get in the best shape of your life, I couldn't recommend a better place than Principia Crossfit. Less

It’s hard to call this place “my gym”. It’s more like my second home. The community here has become apart of my family and I can’t wait to continue sharing more awesome life experiences with them all. Yeah, we lift heavy weights, run, row, and do push ups. But we also have Friendsgivings, holiday parties, “wine and wods”, birthday parties, bbq’s, and fantasy football. Becoming apart of this com... More

It’s hard to call this place “my gym”. It’s more like my second home. The community here has become apart of my family and I can’t wait to continue sharing more awesome life experiences with them all. Yeah, we lift heavy weights, run, row, and do push ups. But we also have Friendsgivings, holiday parties, “wine and wods”, birthday parties, bbq’s, and fantasy football. Becoming apart of this community has changed the path of my life- in the best way possible. Less

I have been part of the Crossfit community for over a decade. I've experienced many gyms and countless coaches. The culture, programming and quality of instruction that Mitch has created at Principia is nothing short of amazing.

Best gym ever!! Not only are the coaches amazing, but so is the whole gym family. I have made great friends, while also being coached by knowledgeable and caring people. I look forward to going to the gym everyday since I joined! I have fun and also strive to hit PRs at the same time. Mitch has built an amazing gym for every level of experience to feel comfortable And succeed. I couldn’t thank hi... More

Best gym ever!! Not only are the coaches amazing, but so is the whole gym family. I have made great friends, while also being coached by knowledgeable and caring people. I look forward to going to the gym everyday since I joined! I have fun and also strive to hit PRs at the same time. Mitch has built an amazing gym for every level of experience to feel comfortable And succeed. I couldn’t thank him & the coaches enough! Seriously best gym ever Less

My husband and i have been in the crossfit community for 10yrs now. We joined principia 1.5 yrs ago after our gym had to close down. I was so sad to leave our family but was so excited to try another box. After seeing what the owner (Mitch) had to offer and giving it a try, we have never been more impressed with a crossfit box. What a great, close knit, happy family this place has created. There... More

My husband and i have been in the crossfit community for 10yrs now. We joined principia 1.5 yrs ago after our gym had to close down. I was so sad to leave our family but was so excited to try another box. After seeing what the owner (Mitch) had to offer and giving it a try, we have never been more impressed with a crossfit box. What a great, close knit, happy family this place has created. There is so much love, motivation and encouragement floating around this gym. Everyone is so friendly and personable. The coach (Mitch) is incredible and is so knowledgeable. If anyone has any injuries of any kind, he takes his time to watch and make sure they can modify anything needed to make a workout be beneficial for them. Anyone i speak to that is interested in trying a crossfit gym out, i encourage them to see Mitch and see how he can change their life. Less

Great community, great coaching, coaches are there to help you be better for life.

Love this place!

Needed a change of pace from where I was previously training and fell in love with the community and the coaching the first night I was there. Every Crossfit Open they do a Friday Night Lights with wonderfully ridiculous costume themes and it brings all morning, midday and evening classes together to have fun. There's always gym events going on, to help grow the community and going to the gym is ... More

Needed a change of pace from where I was previously training and fell in love with the community and the coaching the first night I was there. Every Crossfit Open they do a Friday Night Lights with wonderfully ridiculous costume themes and it brings all morning, midday and evening classes together to have fun. There's always gym events going on, to help grow the community and going to the gym is always a highlight of my day, each week. Coming here has not only improved my skills within Crossfit but also has helped frame my mindset to be better when approaching different aspects in fitness and sometimes life. Wouldn't trade this community for the world,love this second home of mine :) Less

i have never felt like I really belonged anywhere like I do here. The coaching staff is amazing and I truly feel like my overall fitness has improved thanks to Principia. I love this place and am so grateful to be among so amazing athletes. They inspire me and make me want to try harder and be better everyday!

I have been to several Crossfit boxes and Principia has hands down the most supportive community. The coaches are consistent with their emphasis on proper technique and tailor workouts to help you be your best. My entire family enjoys going, and I can't say enough great thing about the place!

CrossFit Magni literally saved my life and I have witnessed amazing positive change in all members. Great people, great equipment, great facility, great programming and amazing attention and detailed coaching!

If you are looking to get in shape and enjoy doing it at the same time, then come here. They welcome you in to have fun and workout with them at every level. Keep up the good work! GET SWOL

Update 2/27/23: wow! It's been awhile since I've updated this. We are nowhere near "bikini" ready but life gets in the way. While we know that fitness should be a priority, it's the first thing to fall off the radar when life happens (our schedules are not very flexible). What I can say is that my fairly inconsistent attendance has still given me strength and a feeling of accomplishment whenever ... More

Update 2/27/23: wow! It's been awhile since I've updated this. We are nowhere near "bikini" ready but life gets in the way. While we know that fitness should be a priority, it's the first thing to fall off the radar when life happens (our schedules are not very flexible). What I can say is that my fairly inconsistent attendance has still given me strength and a feeling of accomplishment whenever I go. People are amazed that I can lift couches. Haha. While the coaches change, the members and owners are still the welcoming, friendly crowd anyone would be lucky to find anywhere, let alone a gym. I have made lifelong friends here and despite my inconsistent attendance, nothing changes from that front. The tools are definitely available to me and offered to everyone, you just have to show up! Update 10/31/19: We've been members at Principia CrossFit and under the tutelage of Coach Mitch for a little over two months now. We are seeing great results and genuinely feel like we've been folded into the family. The class coaches are great too! Bria, Rocky, Katie & Nick - shout out to you all! <3 Many thanks to Principia CrossFit for not only helping us with the lifestyle change of making fitness part of our daily lives but for making us feel so welcome and like part of the family! If you want a great place that's not only about getting healthier and stronger but also teaches you the proper form for lifting and exercising, I'd recommend Principia any day and all day! Original Post September 2019: We've enjoyed four classes here with Coach Mitch's guidance. He has kept us motivated and excited to come to class. I am so happy we went the route of personal training. We definitely had some bad exercise habits aside from just not doing it. :) Thanks Coach Mitch! <3 Less

Great workouts! Great coaching and support!

Dropped in to an early class while on vacation. Super friendly coach and members! Great workout!

This gym is the best part of my day every single day. The people here have become my family! I’ve found some of my best friends because of this gym. The coaches here have helped me combat knee pain that I’ve had since I was a child. I’m stronger than I have ever been in my life! I couldn’t imagine my life without this community!

Awesome box, awesome coaches...awesome community!

The coaching, the programming and the people are what make this gym! I’ve never been to a box this inviting. I’ve seen huge results in a short period of time. I would absolutely recommend giving it a try.

Whether you are brand new to cross fit or been doing it for years, Principia is for you. The owner/coach Mitch is very knowledgeable and is great at tailoring any workout based on a persons level. He has a class for super beginners and a more advanced class for those who want more or if you compete in local competitions. The community at this gym is supportive, fun, and welcoming...which is not ... More

Whether you are brand new to cross fit or been doing it for years, Principia is for you. The owner/coach Mitch is very knowledgeable and is great at tailoring any workout based on a persons level. He has a class for super beginners and a more advanced class for those who want more or if you compete in local competitions. The community at this gym is supportive, fun, and welcoming...which is not the same at other crossfit gyms. There are a lot of class times so I'm sure you can find one that fits into your schedule. All in all...you gotta check out Principia :) Less

We love going to Principia! I say we because now my daughter (6 yrs old) is motivated to try every workout, and Mitch has been great at keeping her motivated. The community has been so great in every class (I've been to almost all the time slots) and we will keep showing up! Awesome!

I love this gym! They are helping me regain control of my healthy habits! The are great for all abilities- whether you are a seasoned athlete or a desk warrior like myself- they help to get you mobile, stronger, and flexible. Coach Mitch is superb at knowing what cues to give to maximize each ahlete’s potential. Form is key and the coaching helps get everyone more aware of things such as body... More

I love this gym! They are helping me regain control of my healthy habits! The are great for all abilities- whether you are a seasoned athlete or a desk warrior like myself- they help to get you mobile, stronger, and flexible. Coach Mitch is superb at knowing what cues to give to maximize each ahlete’s potential. Form is key and the coaching helps get everyone more aware of things such as body positioning, tension, and function. I can’t say enough good things about this place! Less

This community is awesome and very welcoming! The coaches are extremely knowledgeable and they clearly care very much about their members. I am always excited to go to Principia and it's always a great workout!

I absolutely love this gym!! The coaching and programming are spot on. I look forward to every class and love being a member of this amazing community.

I love this gym! I would highly recommend it to anyone that is wanting to start and try CrossFit or to those that are needing to perfect their performance.

5 stars I first started going to this gym to support a friend. I never planned on staying because it’s a 30min drive for me. I pass at least 5 CrossFit gyms on the way. This gym makes that drive worth it. The coaches are great and so are all the other athletes. They are so supportive and kind. I would highly recommend this gym to people who are just starting out or to those that are needing tha... More

5 stars I first started going to this gym to support a friend. I never planned on staying because it’s a 30min drive for me. I pass at least 5 CrossFit gyms on the way. This gym makes that drive worth it. The coaches are great and so are all the other athletes. They are so supportive and kind. I would highly recommend this gym to people who are just starting out or to those that are needing that next level of coaching! Less

Tried crossfit before and had a lot of pain. Mitch has a great foundation program that teaches you the correct way to lift. No pain this time and feel great.

CROSSFIIIIIT!!!

Dropped in while on travel for business and really appreciated this box. Mitch brings a lot of fun, energy, and constructive feedback, and the gym was well organized. I’ll definitely be coming back!

Great community, coaching and facility. Would highly recommend Principia Crossfit to anyone in the Boise area.

Principia CrossFit has helped me take my fitness to a new level. The programming has the best mix of strength and cardio. Coach Mitch takes an interest in every members fitness journey.It is a great place to be.

Great place. Mitch and the other coaches are, first and foremost, concerned with proper form and technique and ensuring that workouts are challenging regardless of the person (scaled as appropriate for skill level, strength, injury, mobility, and experience).

Traveling through Boise and dropped in. Very friendly and welcoming box. Coaching was great and very enthusiastic. I will be back when I’m in Boise. Thank you!!

Had a great experience at Principia Crossfit in Boise with Mitch and the 8am crew! Great vibe, gritty gym and solid instruction - he even got me to accomplish my first successful rope climb (it was actually the magic socks!). In Boise and looking for great Xfit team - go here!

I just gotta say how much I love this place! Everyone in there is so encouraging and always wanting to lift each other up to make everyone better. Coach Mitch is so knowledgeable and always willing to work with you to help work on your form, work around any injuries, and of course push you to do the very best you can do within YOUR abilities. This is a very personalized and uplifting place and I ... More

I just gotta say how much I love this place! Everyone in there is so encouraging and always wanting to lift each other up to make everyone better. Coach Mitch is so knowledgeable and always willing to work with you to help work on your form, work around any injuries, and of course push you to do the very best you can do within YOUR abilities. This is a very personalized and uplifting place and I have to say I am always so excited to get into the gym because of this atmosphere! I am so grateful to have my CrossFit Magni Family 💙🥰💙 Less

Best gym in Boise. Friendly and knowledgeable coaches. Good workouts and nice gym.

Best gym in Boise. Drop in the coaches are great, the fellow crossfitters are very friendly and competitive

I was in Boise for a month and drove by this gym and figured I'd give it a shot. I automatically felt so welcomed by not only Mitch but all the members there! The coaches always had different levels on scaling options which was great because I could decide what was going to challenge me. Highly recommend! I'll definitely be going back if I'm in the area again.

AMAZING coaching staff! They are very patient and personable. I can’t even begin to explain how thankful I am for these guys (and gals). I have only been to a few other gyms but Principia definitely stands above the rest. It’s very apparent that they love their jobs and care about what they do.

First time in. Thanks for the warm welcome Mitch.

Principia is my gym away from home when I visit family in Boise. I really like the atmosphere - the members are friendly, the gym is very clean and Mitch is a great coach. He has a very special ability to break down movements and really explain the muscles that should be used as well as the details of the movement. I will continue to visit whenever I'm in Boise.

This is a great gym with great community. It's so diverse and full of people who are motivated, friendly, and fun! There is something for every level of fitness- a relaxed and non-intimidating atmosphere for beginners and detailed and individualized programming for more experienced athletes looking to crush the leader board. No matter what your "why" is for wanting to be fitter, Principia is for ... More

This is a great gym with great community. It's so diverse and full of people who are motivated, friendly, and fun! There is something for every level of fitness- a relaxed and non-intimidating atmosphere for beginners and detailed and individualized programming for more experienced athletes looking to crush the leader board. No matter what your "why" is for wanting to be fitter, Principia is for you! Less

Love this place! Great coaching and great encouragement for the community of people here.

Principia CrossFit is an awesome box with the core centered around community. It doesn't matter what shape or size you are, they scale all workouts to your ability while pushing you to be better. Mitch is a fantastic coach who's focus is on you as a client and how to push you while preventing injury. I fully recommend giving them a try!

Seriously a great place to change your life! This is a box with a coach that truly knows what he is doing. They will help motivate you towards your goals and not let you fail. If you want a box that cares, look no further. I would highly recommend this place. Just talk to Mitch and change your life.

I have been doing Crossfit for 6 years and have been to many different gyms in my travels as a sales rep. Mitch has a unique and personal approach to help you set your own goals and stay accountable. The exercise programming is top notch and having dealt with some athletic injuries outside of the gym Mitch is able to scale movements to my abilities so I can get the benefits of exercise and avoid ... More

I have been doing Crossfit for 6 years and have been to many different gyms in my travels as a sales rep. Mitch has a unique and personal approach to help you set your own goals and stay accountable. The exercise programming is top notch and having dealt with some athletic injuries outside of the gym Mitch is able to scale movements to my abilities so I can get the benefits of exercise and avoid re-injury. The support the community of members provide to each other is invaluable and the camaraderie of working hard and sometimes suffering together motivates you to get out of bed and get to the gym even when you don't feel like it. Great coaching, athletic programming, and community support. Come join the family. Less

If you want to see a change in your life... go talk to Mitch! He is an excellent coach and has a great box!

Great Place! The coaching staff are very knowledgeable and focus on form/safety. I've already improved in many different categories like mobility, strength, form and endurance. The people and the vibe of Principia is great. I love the competition and the camaraderie amongst the other people. Mitch Iverson is awesome; he goes as far as to organize friendly after work fun stuff, to include, family ... More

Great Place! The coaching staff are very knowledgeable and focus on form/safety. I've already improved in many different categories like mobility, strength, form and endurance. The people and the vibe of Principia is great. I love the competition and the camaraderie amongst the other people. Mitch Iverson is awesome; he goes as far as to organize friendly after work fun stuff, to include, family friendly events. Principia is definitely the gym for me. Less

If you are on the fence about joining a crossfit gym- try Principia once and you will definitely be back. Mitch is a fantastic coach and the whole place just has such a great vibe. You will get a great workout- whether you are a serious fitness fanatic, or like me, just looking for a fun way to stay active. This is seriously the first time I have done any kind of fitness class where I am not cou... More

If you are on the fence about joining a crossfit gym- try Principia once and you will definitely be back. Mitch is a fantastic coach and the whole place just has such a great vibe. You will get a great workout- whether you are a serious fitness fanatic, or like me, just looking for a fun way to stay active. This is seriously the first time I have done any kind of fitness class where I am not counting down until the hour is done. This is an inclusive, supportive environment where I think anyone would feel welcome. Less

Principia CrossFit is a very welcoming gym that provides a fun and energetic atmosphere. Coach Mitch is very knowledgeable, and will provide a variety of ways to perform EVERY excercise. He gives his fullest attention to each member, and that individualistic approach is what sets Principia CrossFit apart from other local CrossFit gyms. I would definitely recommend you give it a try!!

One of the best Crossfit gyms in Boise. I couldn't ask for more from the coaches.

Mitch is an amazing coach and has created and incredible CrossFit gym! Big Thanks!

Awesome coaching, training and experience every session. A great place to improve yourself. Love it!

Principia is the best Crossfit box I have ever been to. Mitch is the greatest coach with the best insight on how to help every individual reach their goals. I couldn't imagine working out and bettering myself anywhere else!

The coach really cares for your progress. Taking individual time to help you with your goals. The community aspect is awesome!!

Love this place!

I love this place! The programming has taken me to a whole new level of fitness. I love the energy from the coaching staff as well as the people working out with me.

Truly is the best gym in Boise! The coaches are all amazing. It's not your average crossfit gym. Their goal for members is to move without pain. The gym culture is awesome, love my gym family!

My favorite place to be, we love Mitch he is the best coach!

Great!

Great facility with an awesome coach!

Awesome coach, awesome box, great people. No matter what time you go, you find a positive attitude from the members and Mitch. Mitch is also great at helping you set goals and finding ways to help you reach them.

I have been crossfitting for 4 years now and recently found Principia Crossfit after relocating to Boise. The programming is similar to what I'm used to; a good warm up targeting what muscles we will use that day, usually an Olympic lift (or other strength exercise) some kind of development movement, and then a met-con. What I am blown away by is how knowledgeable Mitch (owner/coach) is. If I nee... More

I have been crossfitting for 4 years now and recently found Principia Crossfit after relocating to Boise. The programming is similar to what I'm used to; a good warm up targeting what muscles we will use that day, usually an Olympic lift (or other strength exercise) some kind of development movement, and then a met-con. What I am blown away by is how knowledgeable Mitch (owner/coach) is. If I need to scale a movement he will show me at least 3 different ways to scale the movement. If something hurts he will set me up with a stretch immediately. If I need nutrition help, he takes time to sit and discuss. He endlessly goes above and beyond to help me hit my goals and he never loses his faith in me. If you are shopping around, swing by and do a workout! Less

This place is THE place to be for self-improvement on all levels. Mitch takes a holistic look at things - even offering to look at your food logs! Becoming a member of this gym is an investment in your healthy future. The workouts here are scalable to all levels and you will see results. No mirrors means no judgement like a big box gym. The workout is handed to you on a silver platter - no wonder... More

This place is THE place to be for self-improvement on all levels. Mitch takes a holistic look at things - even offering to look at your food logs! Becoming a member of this gym is an investment in your healthy future. The workouts here are scalable to all levels and you will see results. No mirrors means no judgement like a big box gym. The workout is handed to you on a silver platter - no wondering aimlessly through a gym surrounded by equipment you don't know how to use! You are strictly focused on creating results for yourself. Never be afraid of CrossFit. You'll fool yourself daily. Less

I have been crossfitting for 4 years now and recently found Principia Crossfit after relocating to Boise. The programming is similar to what I'm used to; a good warm up targeting what muscles we will use that day, usually an Olympic lift (or other strength exercise) some kind of development movement, and then a met-con. What I am blown away by is how knowledgeable Mitch (owner/coach) is. If I nee... More

I have been crossfitting for 4 years now and recently found Principia Crossfit after relocating to Boise. The programming is similar to what I'm used to; a good warm up targeting what muscles we will use that day, usually an Olympic lift (or other strength exercise) some kind of development movement, and then a met-con. What I am blown away by is how knowledgeable Mitch (owner/coach) is. If I need to scale a movement he will show me at least 3 different ways to scale the movement. If something hurts he will set me up with a stretch immediately. If I need nutrition help, he takes time to sit and discuss. He endlessly goes above and beyond to help me hit my goals and he never loses his faith in me. If you are shopping around, swing by and do a workout! Less

Mitch is amazing at customizing the workouts to your needs. We joined in May 2017 after relocating to Boise from Virginia and haven't looked back. The coaching here is based on science!

Love this place.

Very welcoming environment, members as well as coach. Great Coaching, MItch really pays attention to your form and will scale all workouts to meet your level.

Positive fun atmosphere, personal attention and adjustments makes every workout doable but challenging. Coach Mitch and clients are so welcoming and inspirational!

Great atmosphere and awesome coach! Learning so much about fitness as well as getting strong:)

I have been working with Coach Mitch now for a while. He has helped me improve my skill level and form resulting in solid gains! This is a very supportive community of all ages and abilities!

Getting fit and having fun doing it! Great coaching and positive environment...I can't wait to go back tomorrow!!

Coach Mitch is excellent and I love his programming. This is a great Crossfit community to be a part of.

A gym that provides community + superior training, the best of both worlds!