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

09/05/2026

🔥 BUSY PARENTS & PROFESSIONALS — IT’S COMEBACK SEASON! 🔥

If you’re tired of feeling like getting in shape means spending hours at the gym, following complicated diets, or constantly wondering “What am I supposed to eat?” — our flagship 6-Week COMEBACK Challenge was built for YOU.

🎯 THE GOAL:
Lose 8–16 lbs and up to 2 dress sizes while rebuilding your strength, energy, confidence, and healthy habits.

⏰ THE TIMEFRAME:
Just 6 WEEKS — September 21 through October 31.

And no... you do NOT need to live at the gym or completely change your life.

All we ask is that you:
✅ Commit to 3 workouts per week — just 45 minutes each
✅ Follow our simple, easy-to-follow POP Nutrition Plan
✅ Let our coaches handle the workouts, nutrition guidance, and accountability

Our workouts are designed for ALL fitness levels, and we especially LOVE working with beginners. You don’t need to be in shape to start — that’s why you’re starting!

Your COMEBACK also includes:

🔥 Results-driven coached workouts
📊 InBody Composition Scans
📱 PUSH 42 Challenge Tracker
🥗 Full POP Nutrition Plan
💪 UNBEATABLE Accountability
👥 Private Facebook Support Group
🏆 $300 for the Challenge Winner

And this year we're doing something we've NEVER done before.

We know groceries, bills, gas, and everyday life keep getting more expensive.

So instead of raising the price...

WE LOWERED IT.

💥 This will be the LOWEST PRICE EVER for our proven 6-Week Challenge.

But we're keeping this group small so we can provide the coaching and accountability our challengers deserve.

🚨 STRICTLY LIMITED TO THE FIRST 20 PEOPLE.

20 spots.
6 weeks.
3 workouts per week.
One BIG comeback.

Summer knocked you off track?

Don't wait until January. Your COMEBACK starts September 21st. 🔥

👇 Claim one of the first 20 spots before registration closes.

https://go.mjfitnessct.com/challenge-information

*Challenge is open to new, past and current members.

09/05/2026

🔥 BUSY PARENTS & PROFESSIONALS — IT’S COMEBACK SEASON! 🔥

If you’re tired of feeling like getting in shape means spending hours at the gym, following complicated diets, or constantly wondering “What am I supposed to eat?” — our flagship 6-Week COMEBACK Challenge was built for YOU.

🎯 THE GOAL:
Lose 8–16 lbs and up to 2 dress sizes while rebuilding your strength, energy, confidence, and healthy habits.

⏰ THE TIMEFRAME:
Just 6 WEEKS — September 21 through October 31.

And no... you do NOT need to live at the gym or completely change your life.

All we ask is that you:
✅ Commit to 3 workouts per week — just 45 minutes each
✅ Follow our simple, easy-to-follow POP Nutrition Plan
✅ Let our coaches handle the workouts, nutrition guidance, and accountability

Our workouts are designed for ALL fitness levels, and we especially LOVE working with beginners. You don’t need to be in shape to start — that’s why you’re starting!

Your COMEBACK also includes:
🔥 Results-driven coached workouts
📊 InBody Composition Scans
📱 PUSH 42 Challenge Tracker
🥗 Full POP Nutrition Plan
💪 UNBEATABLE Accountability
👥 Private Facebook Support Group
🏆 $300 for the Challenge Winner

And this year we’re doing something we’ve NEVER done before.

We know groceries, bills, gas, and everyday life keep getting more expensive.

So instead of raising the price...

WE LOWERED IT.

💥 This will be the LOWEST PRICE EVER for our proven 6-Week Challenge.

But we’re keeping this group small so we can provide the coaching and accountability our challengers deserve.

🚨 STRICTLY LIMITED TO THE FIRST 20 PEOPLE.

20 spots.
6 weeks.
3 workouts per week.
One BIG comeback.

Summer knocked you off track?

Don’t wait until January. Your COMEBACK starts September 21st. 🔥

👆 Click the link in bio and claim one of the first 20 spots before registration closes.

*Challenge is open to new, past and current members.

09/02/2026

☀️💪 Morning crew putting in the WORK!

While the world is still waking up, this crew is already getting stronger, building confidence, and starting the day with a WIN. 🔥

You don’t have to be perfect—you just have to keep showing up.

Consistency creates results. 👊

Ready to start your own journey? Come join us for a workout and see what MJ Fitness is all about! 💪🔥 Send us a message to get started.

🚨 FOR THE FIRST TIME EVER — WE LOWERED THE PRICE. 🚨Our flagship 6-Week COMEBACK Challenge is coming September 21 – Octob...
08/31/2026

🚨 FOR THE FIRST TIME EVER — WE LOWERED THE PRICE. 🚨

Our flagship 6-Week COMEBACK Challenge is coming September 21 – October 31, and we're doing something we've NEVER done before.

We know everything is getting more expensive. Groceries. Gas. Bills. Life.

But your health shouldn't be the thing that gets pushed aside.

So we've decided to offer our proven 6-Week Challenge at the LOWEST PRICE WE'VE EVER OFFERED. 🔥

Same proven system.
Same coaching.
Same accountability.
Lowest price EVER.

And there's one catch:
⚠️ ONLY 20 PEOPLE ARE GETTING IN.

Your COMEBACK includes:
✅ Results-driven workouts
✅ InBody Composition Scans
✅ PUSH 42 Challenge Tracker
✅ Full POP Nutrition Plan
✅ UNBEATABLE ACCOUNTABILITY
✅ Private Facebook Group
🏆 $300 for the Challenge Winner

Summer knocked you off track?

Don't wait until January to fix it.

Your comeback starts September 21st.

🚨 FIRST 20 PEOPLE ONLY
🚨 LOWEST PRICE EVER
🚨 ONCE WE'RE FULL, WE'RE FULL

👇 Click the link below to schedule a FREE Class/Consultation and claim your spot before someone else does.

https://mt.mjfitnessct.com/widget/booking/dYd1AwnBmI1CXkZabgfy

Reset. Refocus. COME BACK STRONGER. 🔥

08/29/2026

🔥 Great Spartan Prep sesh! 🔥

Only 3 WEEKS until the big day — Spartan Ultra & Beast in Killington, VT! 🏔️💪

The team is looking strong, focused, and ready for the challenge. Now it’s time to dial it in and finish these final weeks stronger than ever.

Killington is coming… LET’S GO, WARRIORS! ⚔️🔥

08/27/2026

Leave it all on the bag 💥 Nothing beats our strike fit class with great music, nonstop movement & a team that pushes each other to work harder!

🚨💗 ATTENTION LOCAL BUSINESSES — WE NEED YOU! 💗🚨We are currently looking for LOCAL VENDORS to join and support our 6th An...
08/26/2026

🚨💗 ATTENTION LOCAL BUSINESSES — WE NEED YOU! 💗🚨

We are currently looking for LOCAL VENDORS to join and support our 6th Annual “BooB Camp” Breast Cancer Fundraiser benefiting Ann’s Place in Danbury!

📅 Saturday, October 3rd
⏰ 12PM–3PM
📍 MJ Fitness & Kickboxing

This is a great opportunity to promote your business, connect with our local community, and most importantly, support an incredible cause. 💗

Our goal is to raise $5,000 to help Ann’s Place continue providing FREE support and resources to people battling cancer and their families.

Support an incredible cause while getting your business in front of our local community!

🥈 SILVER SPONSOR — $50
• Tax-deductible donation directly to Ann’s Place
• One item donated for our raffle
• Vendor space at the event
• Tagged in public event advertising

🥇 GOLD SPONSOR — $300
• Tax-deductible donation directly to Ann’s Place
• Vendor space at the event
• Company logo on our official event T-shirt
• Tagged in public event advertising
• 2 weeks FREE gym membership for your staff

💎 PLATINUM SPONSOR — $500
• Tax-deductible donation directly to Ann’s Place
• Vendor space at the event
• Company logo on our official event T-shirt
• Tagged in public event advertising
• 28-Day Challenge dedicated to your staff

Please help us support Ann's Place by making a donation through the link below👇
https://donorbox.org/anns-place-community-fundraisers-2026/fundraiser/mariusz-mj-janicki

👕 Gold & Platinum sponsor donations and logos must be submitted by SEPTEMBER 10th to be included on our official event T-shirt.

⚠️ Sponsorship and vendor reach out ASAP to reserve your spot and help us make this year’s fundraiser our biggest one yet! 💗

08/24/2026

🔥 Monday Bootcamp vibes! 💪

Great workout, great energy, and most importantly — everyone having a good time while putting in the work! 😅🔥

Who says Mondays can’t be fun? 👊

🎉 Let’s wish a BIG Happy Birthday to Coach Samantha! 🎂❤️Your positivity, energy, and enthusiasm are contagious, and you ...
08/21/2026

🎉 Let’s wish a BIG Happy Birthday to Coach Samantha! 🎂❤️

Your positivity, energy, and enthusiasm are contagious, and you always know how to make every session fun while pushing our members to give their best. 💪🔥

Thank you for everything you bring to the MJ Fitness family. We hope you have an amazing birthday! 🥳🎈

💥 MEMBER SPOTLIGHT: VALERIA 🔥Big congratulations to Valeria on her amazing transformation! 👏In a short period of time, t...
08/19/2026

💥 MEMBER SPOTLIGHT: VALERIA 🔥

Big congratulations to Valeria on her amazing transformation! 👏

In a short period of time, this hardworking young mom has already:

💥 Lost 13.2 lbs
💥 Burned 6.3% body fat
💥 Built lean muscle
💥 Become stronger, leaner & more confident

And these results are no surprise!

Valeria is extremely consistent, rarely misses a workout, and gives it her all every time she walks through our doors. Being a busy mom isn’t an excuse either—she often brings her 4-year-old son along with her. ❤️

What an incredible example she’s setting for him: work hard, take care of yourself, and find a way even when life gets busy.

Valeria, we’re so proud of your dedication and progress. This is only the beginning! 💪🔥

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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