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

MJ Fitness & Kickboxing

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United States
Danbury, CT
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

09/22/2025

Dear Friends, Family, and Members,

We are excited to announce our 5th Annual “BooB Camp” Breast Cancer Fundraiser to benefit Ann’s Place in Danbury, where all funds go straight to brave warriors fighting against breast cancer.

Please join us for this free event on October 4th, Saturday from 12pm-3pm for Fitness & Fun!

Since our doors opened, it has always been our dream and goal to give back to those who need it the most and be a part of something meaningful.
Our goal is to raise $3500, but we will do our best to raise the most funds possible to support these brave women and their families battling breast cancer.

Ann’s Place relies on the generosity of donors to be able to continue providing these services free of charge.
Their mission is to provide comfort, support, and resources to people living with cancer and to their loved ones. At Ann's Place, all are welcome.

Please help us support Ann's Place by making a donation through the link below👇
https://donorbox.org/anns-place-community-fundraisers/fundraiser/mj-fitness-kickboxing

The process is fast, easy, and secure. Thank you so much for your support... and please don't forget to send this page to any friends you think may be interested in donating!

Please stop by on October 4th to drop your donation and Join Our Free “BooB Camp” Workout, Meet Our Coaches, Local Vendors, Raffle Prizes, Live DJ, Bounce Castle, Giveaways, Family Fun and much more 👇
💗12pm-12:40pm Free Community “BooB Camp”
💗1:30pm-2:00pm Free Community Zumba
💗12pm-2:45pm Live DJ, Giveaways, Collect Donations for Ann's Place & have a good time!
💗2:45pm-3pm Raffles

Thank you very much for your support!

MJ Fitness & Kickboxing

👉Attention Local Businesses: Interested in being a part of our fundraiser? Would you like to promote your business during this event? Please contact us directly👈

*In case of bad weather conditions, we will move our event indoors*

09/21/2025

Big congrats to Coach Josh for another amazing first-round KO last night! 🥊💥
Your MJ Fitness community is so proud of you! 👏🙌

09/19/2025

Nothing is better than pushing through those last reps TOGETHER! 🔥

09/17/2025

🔥 Spartan Beast is Conquered and our Trifecta has been Earned! 🔥

Jonathan, Taylor, Mickey, Alexandra, Nube and I took on the HARDEST Spartan Race in the country at Killington, Vermont. 🏔️

13+ miles of brutal trails, 30 obstacles and over 8 hours of relentless climbs and descents. This was without a doubt the toughest challenge we’ve ever faced… but we all pushed through, supported each other and crossed that finish line together. 💪

I couldn’t be more proud of this team and all the training, sweat and dedication that went into preparing for this moment. 🙌

And the best part? With this race, we’ve officially earned our Spartan TRIFECTA - completing all 3 races in one year! 🏆 AROO!

5k Sprint - June 7
10k Super - July 13
21k Beast - September 13

09/16/2025

🚨 FINAL CALL: Registration Closes THIS WEEK! 🚨

🔥 The September Shred & Shed 6-Week Challenge starts September 22nd, and this is your LAST chance to join!

👉 This is our FINAL 6-Week Challenge of the year — if you’ve been thinking about it, now’s the time. No more waiting. No more excuses.

✅ Burn fat
✅ Tone up
✅ Drop inches
✅ Feel confident before the holidays hit

💸 Win $300 cash for the top transformation
💪 Get expert coaching, training, nutrition, and real accountability
💥 Results guaranteed

We’ve helped hundreds in Danbury change their lives — will you be next?

🎯 STARTS: Monday, Sept 22
🛑 ENDS: Friday, Nov 1
⏳ Spots are almost gone!

👇 Click the link below NOW to secure your spot before it’s too late!

👉https://go.mjfitnessct.com/6-week-summer-shred-challenge-registration-page-5202

09/14/2025

🔥 WE DID IT! 🔥

So proud of my MJ Fitness warriors — Jonathan, Taylor, Mickey, Alexandra, Nube, and myself — for conquering the SPARTAN BEAST 🏔️💪

This wasn’t just any race… it was on the legendary Killington, VT mountain, one of the toughest courses in the U.S. We battled:
✅ 21KM of brutal terrain
✅ 30 obstacles
✅ 7,000 ft elevation
✅ Endless climbs & crushing descents

After 8 hours and 50 minutes, we crossed that finish line TOGETHER. 💯

The journey wasn’t easy. We struggled. We were pushed to our limits. But we NEVER stopped, we NEVER gave up. The best part? We supported each other every step of the way.

But the Beast wasn’t the only victory… 🙌
This race sealed our Spartan Trifecta 🏆 — 3 races in 1 year:
✅ Sprint 5K — June, Bethel NY
✅ Super 10K — July, Poconos PA
✅ Beast 21K — September, Killington VT

No better feeling. No bigger accomplishment. Hard work ALWAYS pays off.
AROO! 🐺🔥

09/12/2025

MORNING GRIND = COMPLETE ✅🔥

While the world was still sleeping…
We were grinding.
We showed up with purpose.
Pushed past excuses.
And crushed another powerful workout 💪

There’s no better way to start the day than with energy, sweat, and a team that pushes you to be better.

Let’s keep rising, grinding, and winning—together. 🌅💥

09/10/2025

🌟 Member Spotlight: HOLLY 🌟

For the past 3 years, Holly has been a powerful force in our MJ Fitness community - and her journey has been nothing short of amazing.

She’s lost over 50 pounds and dropped 11% body fat, but what makes Holly truly special goes far beyond the numbers. She shows up to every workout with heart, hustle, and a smile that lights up the room. 🤩 Her energy is contagious, her mindset is inspiring, and her dedication to this lifestyle never wavers.

Holly isn’t just here for herself - she’s here for everyone. Whether she’s helping run our events, supporting fundraisers, or cheering on her fellow members, Holly is the definition of community. 🤝

She’s completed TWO Spartan Races and she’s already training hard for the next one - because giving up has never been part of her story.

Holly, thank you for being a rock in this gym family. Your presence makes MJ Fitness better, and we’re so proud of everything you’ve accomplished - and everything still ahead.

We love having you as part of this family 💚 Keep crushing it! 💪

09/09/2025

That’s How We GRIND 💪🔥
Every rep. Every drop of sweat. Every early morning alarm.
It all adds up to something BIGGER—
A stronger body, a sharper mind, and a community that never quits.
We don’t just show up… we rise up.
One workout at a time. One goal at a time.
Let’s keep pushing 💯

09/06/2025

🔥 SHRED & SHED 6-Week Challenge 🔥

Registration Is Officially Open!
September 22nd - November 1st

This isn’t another quick-fix fad.
This isn’t endless cardio or starving yourself.
This is a high-intensity, results-driven transformation designed to push you further than you thought possible.

👉 In just 6 weeks, you’ll start seeing a dramatic difference in your strength, energy, and physique.

What you get:
🔥 Custom Meal Plan to fuel your results without the guesswork
🔥 Personal Accountability Coach to keep you on track every day
🔥 Cutting-Edge Workouts at the Gym (NOT an online program)
🔥 Supportive Community of Driven People on the same mission
🔥 …and so much more!

⚡ This program is ONLY for people who are serious about change. ⚡

If you’ve reached that point where enough is enough — this is your moment.

📅 Spots are — only 20 openings!

If you’re still reading this, you are EXACTLY who we’re looking for.

💥 Contact us for more info Now and lock in your spot for Shred & Shed 6-Week Challenge!

09/03/2025

🎉 Congrats to our 28-Day Buddy Detox Challenge Winners! 🎉

👏 Super twin sisters Rachael & Raquel and the powerhouse duo Holly & Gina absolutely crushed it! 💪💪💪
You should all be SO proud of the dedication, discipline, and hard work you put in. 🔥

👉 Want results like these? Don’t wait—our Shred & Shed 6-Week Challenge is NEXT and it’s going to be a BIG one 🏆 Space is strictly limited so claim your spot now!

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

Website

http://mjfitnessct.com/

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