Our Success Stories


February 20

I’m very grateful to find you the first time that I walked through. Definitely I couldn’t believe that I was able to do that kind of training, because in my mind, was just for people with fitness skills.

I had so many excuses like my age, my back problems, my recently shoulder surgery etc, even though when I knew that I needed it, because that was my Dr. recommendation on my physical exam that showed as a result a pre- diabetic condition…

betty's story


My name is Betty i am a mother of a wonderful daughter she is 21 years old. For the past 15 years i have been trying to lose weight. I even joined a gym. But I never saw any results on me. I used to get injured a lot because basically they never told me I was doing an incorrect form of the exercise. One day one of my good friend post something on Facebook about a place call MJ Fitness. I call my friend and i ask her what did she thought about the place, and her reaction was like “Betty It is an amazing place”.



“Hi everyone my name is Eustolia I’m 49 years old; I’m a mother to four amazing girls and a grandmother to 5 incredible grandchildren. For the past 29 years I have struggled with my weight I was super busy raising my girls that I never took the time to really put my weight first until a couple of years ago. I tried going to the gym, I tried all these different kinds of diets and nothing was working;

Gab M.'s 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. After graduating from University of New Hampshire with my bachelors degree, I had gained a lot more weight than expected…

Mike D's Story


I have been coming to MJ Fitness for about a year now, and MJ is a complete professional, he motivates you and has new exercises at classes every night. I can’t say enough about MJ and his positive energy, if he knows you are serious with the training he will help you set up a ….

Amanda's B.'s 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. My weight has always fluctuated even as a young kid. I got to a healthy weight in high school and maintained it up until I got pregnant with…

Kim M.'s Story



I have struggled with my weight for most of my life. I started to gain weight as a teenager, lost it, then gained it back as a young adult. I gained after I got married and after both of my daughters were born. I tried a lot of different diets and a few different exercise routines that worked for a short time, but never long term. In December 2010, I lost my Dad suddenly and within a year, I reached my highest weight ever. I gained more than I did with both of my pregnancies. I had no motivation to make a change until 5 years after my Dad passed away. I was approaching my 40th birthday and really wanted to be healthy. A good friend of mine helped me with my eating habit and encouraged me to exercise…

What We Offer

OUR 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

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.