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


Visit MJ Fitness & Kickboxing in Danbury, CT today to discover your inner strength.


Mariusz Janicki with his son Kaden at MJ Training in Danbury. Photo by Phil Hall

Polish kickboxing champ Mariusz Janicki muscles his way into Danbury fitness scene

By Phil Hall - October 28, 2019
Westfair Business Publications


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.

Reviews from Happy Clients

MJ Fitness Success Stores

Gab M's Success Story

Hi everyone, my name is Gab M. I am 23 years old and am pursuing a masters degree while holding down a job and helping to care for my niece and nephew...

Mike D's Success Story

I have been coming to MJ Fitness for about a year now, and MJ is a complete professional, he motivates you and...

Amanda B's Success Story

I have been going to Mj Fitness since June and I don't intend on leaving anytime soon! I'm going to give you a little of my backstory....

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.