Meet our dedicated personal trainer

At MJ Fitness, our goal is to help you reach your goals through personal training sessions and different strength-building classes in Danbury, CT. Whether you want to build muscle or lose weight, we will give you one-on-one attention and discuss the best ways to reach your goals with you.

When you visit MJ Fitness, you'll benefit from a personal trainer who is truly invested in health and fitness. Owner Mariusz 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 Strike Fit or kickboxing classes, you'll challenge different muscle groups, improve your health and burn fat.

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
  • Martial arts instructor certification
  • CPR/AED certification
  • Boot camp instructor certification



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

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 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 a fitness boot camp and personal training classes, look no further than MJ Fitness in Danbury, CT. Our trainers have years of experience in the fitness industry and numerous certifications. When you visit our gym, 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:

  • Kickboxing classes: Gain self-defense knowledge and sharpen your reflexes.
  • Personal training sessions: Try a workout uniquely designed to help you achieve your fitness goals.
  • Strike Fit classes: Challenge your entire body with a nonstop, action-packed group class.
  • Fitness boot camp: Get serious about your fitness and commit to a challenging boot camp.



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