MJ Fitness & Kickboxing

MJ Fitness & Kickboxing We Are Danbury’s #1 Transformation Program. Results-focused, Community-driven. We're Dedicated To Transforming Lives.

Bio
Former European Full Contact Karate Champion Mariusz Janicki is the founder and owner of MJ Fitness & Kickboxing . After more than 12 years of competing as a top level full contact fighter, Mariusz has retired to pursue his passion for helping others in achieving their fitness goals. Whether you are looking to lose weight, tone muscle, improve cardio, or simply live a healthier lifestyle, his focus is on you and your personal fitness needs. In addition to fighting, Mariusz has taught as a PE Teacher and Martial arts Instructor working with kids, adults, and professional athletes alike. Mariusz is always researching new training methods and ways to provide his clients with the most functional and effective workouts possible. With accomplishments such as two-time Polish Full Contact Karate Champion, four-time US Lightweight Champion, and amateur Muay Thai/K1 rule record of 8-2, Mariusz has seen, experienced, and mastered a variety of training styles from around the world. This first-hand fighting experience paired with a background in Body Building and Strength Sports Training, Boot Camp, Martial Arts, Personal Training and more, you can be sure Mariusz will help you both mentally and physically in achieving your fitness and weight loss dreams. Education/Certification
Master's Degree in Physical Education (2003) Wroclaw, Poland
Certified Trainer of Body Building and Strength Sports (2003) Worclaw, Poland
Martial Arts Instructor
Certified Personal Trainer
Certified Professional Nutritionist
Certified Boot Camp Instructor
Certified CPR / AED

04/10/2026

If you’re ever looking for inspiration… look at Janet 💪🔥

In her 60s, she’s not slowing down — she’s leveling up.
Climbing ropes, running races, taking on Spartan challenges, and continuing to push herself every single day.

She reminds all of us that age is just a number, and your mindset is everything.

This is what commitment, consistency, and heart look like.
Janet, you inspire everyone around you more than you know 👊

04/07/2026

Just two months ago, Vitoria struggled to get up the rope.
Now she’s climbing it with confidence — up and down 💪🔥
This is what it’s all about at MJ Fitness.
Helping people believe in themselves, push past limits, and discover strength they didn’t know they had.
We’re here to support you, challenge you, and help you become your best self.
So proud of you, Vitoria 👏

📣 NEW TEAM MEMBER ALERT 📣We’re excited to introduce one of our newest team members… Lesley! 🙌Lesley is joining us as our...
04/06/2026

📣 NEW TEAM MEMBER ALERT 📣

We’re excited to introduce one of our newest team members… Lesley! 🙌

Lesley is joining us as our new front desk receptionist, and she’ll be one of the first friendly faces you see when you walk through our doors 😊

Make sure to say hello and give her a big MJ Fitness welcome! 💪🔥

🚨 REGISTRATION IS OFFICIALLY CLOSED — WE ARE FULL! 🚨We’re excited to meet the 25 local people who joined our Last FREE 2...
04/04/2026

🚨 REGISTRATION IS OFFICIALLY CLOSED — WE ARE FULL! 🚨

We’re excited to meet the 25 local people who joined our Last FREE 28-Day Transformation Challenge.

They made the most important step — they raised their hand, and decided to be part of the best fitness community around 💪🔥

This is where real change begins.

If you missed this last round, don’t worry — we’re always here and would love to meet you, learn about your goals, and help you find the best program for your fitness journey.

📞 All it takes is just one call.

03/31/2026

Sun’s barely up ☀️
Gloves already on 🥊
Morning crew doesn’t play 💪🔥

💥 MEMBER SPOTLIGHT: Busy Mom. Big Results. Meet Samantha.Let’s give a HUGE congratulations to Samantha for her incredibl...
03/25/2026

💥 MEMBER SPOTLIGHT: Busy Mom. Big Results. Meet Samantha.

Let’s give a HUGE congratulations to Samantha for her incredible transformation! 👏

She’s down 40 pounds and has burned an amazing 9.1% body fat 🙌

But what makes her story truly special…

This didn’t happen overnight.

Samantha has been part of our MJ Fitness family for 4 years — showing up, staying consistent, and continuing to push herself to get better every step of the way.

She’s a wife and a proud mom of two boys, balancing a busy life, yet still making time to show up almost every single morning and give it her all 💪

No shortcuts.
No quick fixes.
Just commitment, discipline, and a mindset that refuses to quit.

And if you’ve ever been in a class with Samantha, you already know — she brings incredible energy, positivity, and a smile that lifts everyone around her.

Samantha, we are so proud of you. Your journey is a powerful reminder that real transformation takes time, consistency, and heart — and you’ve shown all of that and more.

Keep going… because this is only the beginning 🔥

03/23/2026

Happy Monday 💪
New week. New goals. Let’s get after it 🔥

03/20/2026

Hollow body hold challenge on a dumbbell with the team! 💪

03/18/2026

Fast hands. Strong mindset. 🥊⚡
Kickboxing class bringing the heat 🔥

🍀 Happy St. Patrick’s Day from all of us at MJ Fitness & Kickboxing! Wishing you a day filled with luck, smiles, and goo...
03/17/2026

🍀 Happy St. Patrick’s Day from all of us at MJ Fitness & Kickboxing! Wishing you a day filled with luck, smiles, and good energy! 💚

Address

5 Shelter Rock Road, Building D, 2nd Floor (next To DMV)
Danbury, CT
06810

Opening Hours

Monday 6am - 9pm
Tuesday 6am - 9pm
Wednesday 6am - 9pm
Thursday 6am - 9pm
Friday 6am - 9pm
Saturday 6am - 12pm

Telephone

+2038854580

Alerts

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