Meet our dedicated personal trainer

At MJ Fitness & Kickboxing, our mission is to help you reach your fitness goals through our personal training sessions or different fitness programs we offer at our studio in Danbury, CT. Whether you want to lose weight or build muscle, we will give you one-on-one attention and do our best to make you succeed on your fitness journey.

When you visit MJ Fitness & Kickboxing, you will benefit from a personal trainer who is truly invested in health and fitness. Owner Mariusz "MJ" Janicki is always staying up-to-date on the latest and greatest training methods so he can provide the most effective workouts possible. Whether you are taking our fat burning group classes like Bootcamp or StrikeFit, or a One-on-One Session, we will challenge your body and mind, improve your health and confidence.

Mariusz has extensive knowledge and experience in the fitness industry and holds a variety of certifications, including:

  • A master's degree in physical education
  • Body building and strength sports certification
  • ISSA personal training certification
  • ISSA Professional Nutritionist Certification
  • Martial arts instructor certification
  • CPR/AED certification
  • Boot camp instructor certification

Jump-Start Your Fitness Journey

Get ready to transform your body with a personal trainer in Danbury, CT

Are you ready to embark on a journey of self-discovery through fitness? If you're like most people, you're striving to get in shape but may not have all of the tools and resources to do so.

Every individual's fitness journey is different, and it's important to remember that your personal training needs will likely be different than others, as well. When you speak with a personal trainer from MJ Fitness & Kickboxing in Danbury, CT, you'll gain more insight and will be ready to start transforming your body.

Find a personal trainer in Danbury, CT today to discover a healthier, happier you.

Get ready to feel the burn

When searching for the best fitness group programs or personal training, look no further than MJ Fitness & Kickboxing in Danbury, CT. Our trainers have years of experience in the fitness industry and numerous certifications. When you visit our studio, you can expect nothing less than a challenging and effective workout that will leave you feeling stronger and more capable than before.

We offer a variety of different options to meet your individual needs, such as:

  • Fitness Boot Camp: Get serious about your fitness and commit to a challenging¬†workout.
  • StrikeFit Kickboxing: Challenge your entire body with a nonstop, action-packed session.
  • Personal Training: A workout uniquely designed for you to help achieve your fitness goals.

No matter what your fitness goals are, we can help you achieve them one workout at a time. Visit our studio in Danbury, CT today to speak with a personal trainer about our fitness programs.

Reviews from Happy Clients

It's so easy to hit the Gym and end up on the treadmill for the 3rd time that week, I was searching for group classes and a trainer to break up the average gym routine and help keep me on track. I have attended Strike Fit, Boot Camp and had one on one Personal Training with MJ. His classes are fun and challenging, the small group classes allow for the one on one observation and guidance that is perfect for all levels. Everyone is so friendly and encouraging, we have all been the first timer, intimidated by working out alone or in a social setting. I can say with certainty that I have become stronger, have more energy and am leaner (over 20 lbs lost!) but most importantly I have more self-confidence. We all have days where we are low energy or unmotivated, MJ has coached me through those difficult days and always reminded me there are no limits to what I am capable of. I would recommend MJ Fitness and Conditioning to anyone looking for a fun and challenging fitness program. Thank You MJ!

Nicole P.

MJ creates a fun and comfortable environment. He's welcoming, encouraging, and motivates you to do the best that you can. Every class is always challenging and different, he adds in unique workouts that I've never seen or tried before.

Ray I.

I have never been comfortable enough with myself to take a class. I'm extremely self conscious. Walking in my first day I was nervous and full of anxiety. Upon walking in I was welcomed with kind words and a smile. MJ does an amazing job at making you feel comfortable, welcomed and pushes you as far as you can go. Everyone in the class is supportive and encouraging. I look forward to Tuesday and Thursday classes. I know I'll walk in to a smile and a good sweaty workout. I'm excited to finally lose these last 50 lbs with MJ and the class.


I've only been to 1 gym where there's a variety of cardio machines and free weights. At first, since everything was a new experience, I enjoyed trying out all the machines; but, eventually I got bored. Then I saw one of MJ's video on Facebook and it looked really complicated, but I was really interested. I enjoyed both StrikeFit and Boot Camp classes. Not only is MJ motivating and pushing you throughout the class, but the other people you're working out with are also encouraging you and making you feel comfortable. The atmosphere is friendly, inviting, and comfortable. His prices are very reasonable. You can pay as you go or pay for a month (prices vary depending on how often you plan to go) for a better discount. Overall, I recommend anyone to try it out. If you've never exercised in your life, MJ will be there to guide you. If you're really active, try something different.


Good place super clean space out and I feel safe when I go there the Zumba class with Bella & patty is the best class in Danbury also the other instructors are very good super professional and recommend MJ Fitness & kickboxing because they helped me get my goals

Pam E

Great coach, great place, always great workout! 5 stars plus one more!

Benedict Maria A

This is a great fitness center. I would encourage you to join if you want a whole body workout and healing. MJ has great teaching skills. Each class is as if you are receiving personal training and support. Coming here is very welcoming and positive. Each class challenges me and helps me build my endurance of mind and body. It is a great investment of time and money!

Michelle O

Great place. New location and he has all the protocol covered. Coaches and classes are great. I joined last week and have enjoyed the classes. Great workouts. Come try a class you won't regret it!

Michele M

Just getting back into this kind of workout and it's exactly what I expected the staff there has been more than helpful with everything I like the fact that they correct you when working out if they feel it's not the right way I recommend MJ fitness who wants a great workout. glad to be a member there

Roe B

I joined MJ Fitness almost 2 years ago and I love it! Fun classes that provide the best workout and best results! I was never a fan of group classes until I tried this gym!
MJ Fitness provides a very comfortable, nonjudgmental environment. I love the family dynamics.
Highly recommended for anyone looking to stay in shape or get in shape. All the classes and all the coaches can help you lose weight and/or gain muscle!

Christina G