I walked into the doors of 646 last June to find a new CrossFit gym as the other ones I've tried in Tucson were not working for me. I had trained with CrossFit on and off for 10years prior and knew what a great gym looked like. Unfortunately I let myself get very out of shape quickly in 2020 and needed somewhere to train. The initial visit sparked my curiosity immediately! The atmosphere and energy in the building was great! I had a work out and was instantly hooked. Then the gym closed again due to covid, so they decided to have parking lot workouts. I knew I was in a good place when I saw that Matt&Mel the owners were able to vary it up with limited equipment and space in an parking lot. I said to myself imagine what happens when we have full access to the gym, working out will jump up a notch to say the least. In the past year I've been there I've lost roughly 65lbs and have been thriving since the end of August! All the trainers I've had the pleasure of meeting and working with have been phenomenal! Matt and Melissa(owners) are exceptional with their programming, attitude, and professionalism! Rachel, Kendra and Tyler all have been nothing short of great as well! All the coaches actually care about the well-being of the members, which believe me isn't always the case at a CrossFit gym. The other members are nice and courteous, who try and help each other get better! It's definitely a family environment, if which your fortunate enough to be a part of will be one of the best decisions you could make. I joined the competition team in January and they welcomed me with open arms. While I did the work, and put in the effort, I couldn't have done it without their program, and pushing yourself attitude. There is no ego at CrossFit 646, which makes people able train constantly without getting injured. We all push each other in competitive but helping way. Can't speak highly enough about this place. If your in Tucson there is absolutely no other choice for a place to build your body and mind in my opinion! I'd like to thank Matt and Melissa and all the coaches and members at CrossFit 646! From the bottom of my heart this is hands down the best gym/environment I've ever been apart of, Stay Strong!!!! read more

This box changed my life in a way that words cannot explain. After being apart of this box for a little more then a year I have nothing but positive things to say. When I joined a year ago I was very out of shape, had no motivation to workout or to do anything, I started getting migraines due to being stressed out about being out of shape, I had nothing to keep me happy. I was on summer break right before my senior year of high school when my mom signed me up for CrossFit. I was a little scared and nervous before my first class, I was doubting myself knowing I wasn't as strong or in shape as the athletes in this box. Matt and Mel made me feel welcome, and made this box a second home for me. When I started I was 275lbs, the heaviest I've ever been, I tried to wear a belt for a WOD and it wouldn't fit me, that's when I knew something had to change. Once I got committed to going on a regular basis my whole mentality changed and then after grinding and truly staying committed to the work so did my appearance. After talking nutrition with Matt he got me motivated to lose weight. He gave me this sense of confidence I never had before about dieting and tracking food. I have lost 75lbs since joining, I have gained an amount of muscle that I never knew I could get. My mental and physical health has been off the charts. Matt, Mel and all of the coaches at 646 want you too succeed and when you do they are exploding with joy for you but then soon are pushing you to beat your previous self and get better. The knowledge that Matt and Mel have about the human body and how to effectively train it is out of this world. The two of them have impacted my life in a way that I can't explain with words, the box is world class and if you come here you will get gains. You will reach your goals and your life will be an enjoyable experience, except when you rip a callous... read more

What can I say about CrossFit 646?! It is the best box I've ever been a part of! I moved to Tucson with my wife for 6 months while she did her grad school internship down there and decided to give 646 a shot since it was the closest box to me. I honestly wasn't expecting much since I wasn't going to be a permanent member of the community, but the moment I stepped in the door, the owners, Matt and Mel, were super welcoming. I felt they were both truly interested in getting to know me and my background which made it easier for me to open up (I can be more introverted at times). They both have an extensive background in not just CrossFit, but sports performance training and Olympic weightlifting. Their dedication to their craft shows in not just their deep knowledge base, but also by being very active and present coaches during class time and outside of class time. Every time I observed them coaching, they were always walking around and checking technique and correcting if need be, offering encouragement and generally being very involved. They are what you want as coaches/owners and represent the profession very well. The other coaches, Camille, Trevor, Rachel and Courtney, were very friendly from the outset as well and made sure to introduce themselves from the get go. After 6 months, I had to leave Tucson and unfortunately am unable to take CrossFit 646 with me. The community there really is top-notch with many friendly people who I am going to miss. Don't bother checking out other boxes - CrossFit 646 is the best in Tucson! read more

If professional programming and training, a high-quality facility, top-of-the-line equipment, knowledgable coaches and a friendly environment are important to you, look no further because CrossFit 646 and 646 Weightlifting Club are the exemplar of the above. Safety is of course the number one priority and smaller class sizes ensure attentive coaching and an environment conducive to learning the movements thoroughly and properly. Matthew and Melissa are commendable coaches and athletes - the epitome of "walk the walk and talk the talk". Their extensive knowledge and experience in the sports and health field is immaculate and easily visible through their professionalism in coaching and programming. The equipment is unrivaled and the facility is well-kept and clean. But don't get it twisted here, the workouts are demanding with every intent to push you physically and mentally. Rest assured that even after the most grueling workouts you'll still get a high five from everyone when it's all said and done. Every day is a new challenge and a healthy balance between challenging workouts and a great community. The list goes on. CrossFit 646 is truly the place to be if you want to be strong, healthy, and happy! :-) read more

As a 60-year old, even though fairly fit, walking in to a CrossFit gym was daunting. I was growing tired of working out on my own at a big box gym; on the machines, ho-hum, where no one grunts or lifts anything heavy over their heads. And where most members spend as much time peering at their cell phones as they do actually working out. I wanted to find a gym with knowledgeable trainers, a supportive atmosphere and a sense of community. Enter CrossFit 646! I was apprehensive at first: can I really do this? My focus is Olympic lifting. I also worried I might hurt myself. Not any longer. I feel in capable hands and fully trust the progression of my training. The pace of learning new skills and addition of weight to the bar perfectly suits me in this stage of my life. A challenge for sure, but not overwhelming. Perfect! My respect for owners Matt & Melissa continues to grow. They have created an awesome environment in which to train, learn, build confidence, have fun, and get fit. At CrossFit 646 I can do all this while feeling comfortable, accepted, and most importantly, encouraged. read more

I highly encourage people to stop by and check this place out. The first thing that comes to my mind when I think of this place is professionalism and a highly friendly environment. Melissa and Matt are very knowledgeable and have a deep understanding of everything that goes into play on each workout. They are very meticulous when it comes to good form and proper technique. They are also great at adjusting the workouts to your fitness level. Enough that it's still challenging, but doesn't feel too overwhelming. The workouts are hard, but you will leave this gym eager for more. I am just sad I did not find this place sooner! I've been going there almost every day since I joined and I have to say it is well worth every penny. For once in my life I actually look forward to working out. Forget about all the hassle that involves joining a gym, the lengthy contracts and all the loopholes. This place doesn't roll that way. That's another thing I loved about CrossFit 646, which is awesome. Melissa and Matt are truly the best. read more

Having lived in Tucson the past four years and getting to know the entire CrossFit and Olympic weightlifting community I can assure you this is the best gym in town. Matt and his wife Melissa are the most knowledgeable and competent coaches in southern Arizona by far. The equipment is all top of the line, they even use Pendlay plates for CrossFit classes. If you're interested in Olympic weightlifting, Their weightlifting programming and coaching will get you as strong as possible. Melissa is one of the strongest women in the nation so you're not just listening to someone who got a weekend certification teaching you to snatch. All the members are super friendly and you never feel intimidated. Both Matt and Melissa are extremely proficient in all the movements they coach (you won't be taught how to muscle up by someone who can't do it themselves). No matter what physical shape you're in now, fitness knowledge or ability, I promise you, they will get you to be the best possible version of yourself. read more

If there were 6 stars, I'd give them. I am a 66 year old drop in and this was my experience at 646: Super gym, experienced staff, great planning and superb execution. I go to 646 when I'm in town. The River Road location is so convenient. I am not a competition athlete; they scaled and adjusted every exercise to movements I could achieve safely but with enough challenge to let me know I was getting better and stronger. The ambience, the attitude of the gym was... addictive. I wanted to be there. Every person welcomed me in. It felt like I was on the team from the minute I stepped through the door. Some will say Crossfit isn't for everyone. Matt and Mel and the team at 646 make sure that Crossfit, absolutely, IS for everyone.Thank You. read more

The BEST box in town! The owners, Matt and Mel embody the CrossFit philosophy and they have the experience and business sense that makes CrossFit 646 special. They are both great athletes, trainers, teachers and mentors. Their staff of trainers are great as well and guide us through the workouts mindful of our form watching so we don't hurt ourselves. I was never athletic and struggled to find something that would hold my interest. When I walked into CrossFit 646, I didn't know what I was in for but even though it was hard, i wanted to come back. No "I should go", only disappointment when I couldn't go. I highly recommend CrossFit 646. Don't be afraid to come in, there is no judgement, side looks or players. read more

I have been going to 646 for around 6 mos. +. I found myself not only eating better, but enjoying the workouts that Matt York has planned for me and my workout partners. The gym is owned by Matt and his very talented wife Melissa, whom both take great care in designing a workout geared for my 'oldish and very out of shape body'. I do not have much experience with gyms, but I believe I have found the right trainers and absolutely the right gym. Hey, I have lost almost 25#, without starving myself and I physically feel 100% better than I did 6 mos ago... read more

Amazing teachers, leaders and friends! Matt and Mel share their wealth of knowledge and customize to every fitness level and goal. It is obvious that they care that their clients are happy, healthy, WELL and Safe!! Every day is a new and exciting challenge with great energy and positivity. Every individual is encouraged to perform at their highest, with complete understanding and accommodation for what that level actually is! You just can't find a better atmosphere to achieve your fitness goals or a better community/family group to achieve them with! read more

Y'all! This is an amazing gym. After trying out some other gyms at different price points my husband and I both found this to be the best fit for us. The community here is outstanding and encouraging. I am so impressed with the gym community Matt & Mel have built. Their knowledge of fitness and desire to genuinely just simply help others is evident. Come. Check it out! You'll be glad you did. One year later my husband and I are so glad we popped in one day! read more

Crossfit 646 is the BEST! The owners, Matt & Melissa are so friendly and willing to help out new Crossfitters. They are also good at getting me motivated and the workouts are never the same, so you won't be bored. It's amazing what you can do using your own body weight, some weights and very little gym equipment. My husband and I both love it and we usually can't agree on the best workout on our own. So glad we found them. I would recommend to all of my friends read more

Dropped in last week with two work associates and Matt was fantastic in welcoming us and making us feel comfortable. Most places you go to, even if its your regular gym, people are shy and a little cold. That was not the case with CrossFit 646! Everyone either greeted us or gave us a high five after the workout. If you are looking to drop in or give CF a try for the first time, I would highly recommend CrossFit 646 read more

Matt & Mel are as good as it gets and their vision, dream, dedication, etc etc gave us CrossFit 646. I recommend this gym for everyone, whether you are a beginner, serious athlete or Olympic lifter. You will be met with a smile and years of education and training to help you along on your journey. The rest of the coaches are top notch and the members are all a fantastic group of people1 read more

Mat and Mel are amazing, knowledgeable teachers who patiently coach their clients to perform exercises correctly, while always urging them to safely reach for ever-higher personal accomplishments. Their gym is such a positive environment, so friendly, supportive and welcoming of athletes of all ages and abilities. The daily exercise routines are varied, effective, purposeful and fun! read more

This gym is amazing, not only because is fully equipped, but because of the professionalism, the awesome supportive environment and the great coaching! Mel and Matt have an awesome team, and they both are also always on top of guiding every single cross-fitter, from the very beginning. Thank you, 646 Team! read more

Melissa and Matt are amazing! I love the crossfit classes and it is very warm and inviting! They are amazing teachers! I was a little nervous joining because I hadn't really done crossfit before, but this is the perfect. Every class is different, so it's not the same everyday, which is awesome! read more