Reach Your Fitness & Weight Loss Goals with us

Contact us to learn more about our programs

What We Offer

OUR programs

commit to health and fitness


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.

full body workouts that leave you energized

go beyond your limits

Our Clients Believe in Us

Here Is What They Are Saying

Train With Experts

MEET our Founder & Head Coach

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

former European full-contact karate champion

Our founder has also been featured in Westchester & Fairfield County Business journal.

Read the article

By Phil Hall – October 28, 2019
Westfair Business Publications

Crazy Summer Sale!

21-day fitness jumpstart special!

unlimited classes

Ready to kickstart your fitness journey? 

Our 21-day jumpstart is the perfect way to crush your health and wellness goals! 

LIMITED TIME OFFER: $97 for unlimited classes! 


This is our lowest offer of the year, giving you exclusive access to unlimited group classes for just $97. 

Say goodbye to excuses and hello to a healthier, happier you!


Crazy Summer Sale!

Join the
Spring Challenge


Are you having a hard time figuring out where to start on your journey?

Take time to really think about what’s important to your life, why it’s important, and then create realistic measurable goals to use as stepping stones. Join a wellness community/gym!

I have tried so many gyms in the past and can certainly say that this is the best place to do your workout, and get the results you want.

The challenge is a great way to jump start your fitness goals and the meal plan helps you lose body fat faster. I would highly recommend MJ fitness to anyone looking for a top- quality workout and a healthier lifestyle.