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

🏔️ KILLINGTON. WE GAVE IT EVERYTHING WE HAD. 🏅Last Saturday, the MJ Fitness Spartan Team took on one of the toughest and...
09/21/2026

🏔️ KILLINGTON. WE GAVE IT EVERYTHING WE HAD. 🏅

Last Saturday, the MJ Fitness Spartan Team took on one of the toughest and most challenging Spartan courses out there — the legendary Killington, Vermont.

9 MJ Fitness warriors stepped up to the starting line for the 21K Beast.

And ALL 9 CROSSED THE FINISH LINE. 💪🔥

As their coach, it’s hard to put into words how proud I am.

I’ve watched their entire journey leading up to this moment — months of training, early mornings, long workouts, sacrifices, sore bodies, setbacks, and the commitment to keep showing up.

You can’t buy that kind of experience. You have to EARN it.

And Killington made us earn every single mile.
Thousands and thousands of feet of leg-shredding climbs. Knee-crushing descents. Brutal terrain. Obstacles. Exhaustion. Hours and hours on that mountain.

Our warriors battled anywhere from 8.5 to 11.5 HOURS to earn that finish line.

But they ALL finished. 🏅

For me, I took on a different challenge — the 50K Spartan Ultra. This time, I didn’t finish.
I didn’t make it to the transition station before the cutoff and received a DNF.

No excuses. No regrets.
We all left everything we had on that mountain. There was nothing more to give.

Sometimes the biggest lessons don’t come from the medal around your neck. They come from pushing yourself to your absolute limit and finding out what you’re made of.

Saturday was an incredibly humbling experience for all of us.
We walked onto that mountain as one version of ourselves…
We walked away stronger, tougher, and better.

Congratulations to every one of our MJ Fitness Spartans. I’m beyond proud of you. You earned this one. 👊

Stay tuned for plenty of pictures and videos from an unforgettable day!

🏁 NEXT STOP: Spartan 5K Sprint — Fenway Park, Boston!
AROO! AROO! AROO! 🔥🏅

🔥 BIG WEEKEND AHEAD FOR MJ FITNESS! 💪🏔️Tomorrow we’re taking on my biggest challenge yet — me personally the infamous Sp...
09/18/2026

🔥 BIG WEEKEND AHEAD FOR MJ FITNESS! 💪🏔️

Tomorrow we’re taking on my biggest challenge yet — me personally the infamous Spartan 50K ULTRA — while 9 MJ Fitness warriors take on the 21K BEAST at Killington!

As their coach, I couldn’t be more proud of this team. I’ve watched the early mornings, long workouts, tired legs, discipline, and months of preparation that brought us to this moment.

The work is done. Now it’s time to trust the training and go to battle! 👊

A few fun facts about what’s waiting for us:
🏔️ Ranked as the toughest Spartan venue in the United States
🏃 32 miles of relentless mountain terrain
💪 60+ obstacles for Ultras
⛰️ Over 15,000 feet of brutal elevation gain
🦿 Knee crushing descends
😈 The infamous Death March
⏰ Strict time cutoffs
🌧️ Depending on conditions, 50–70% of racers DNF and never reach the finish line

Tomorrow isn’t about being comfortable. It’s about finding out what we’re capable of.

Proud of every one of you. Let’s bring that MJ FITNESS ENERGY to Killington! 🔥

AROO! AROO! AROO!

09/17/2026

🔥 No excuses. Just WORK! 💪

Great job, Julissa, crushing your one-on-one session with Coach Josh! When you’re willing to push yourself outside your comfort zone, that’s where the real progress happens.

Keep pushing. Keep getting stronger. Keep showing up! 👊🔥

🚨 THIS IS IT — THE FINAL 2 DAYS TO REGISTER!Our 6-Week COMEBACK Challenge starts Monday, September 21st, and we are down...
09/16/2026

🚨 THIS IS IT — THE FINAL 2 DAYS TO REGISTER!

Our 6-Week COMEBACK Challenge starts Monday, September 21st, and we are down to our FINAL 2 SPOTS.

Once those 2 are claimed, registration is CLOSED.

And remember — we lowered the price of this challenge to our LOWEST PRICE EVER.

🔥 YOUR 6-WEEK COMEBACK!

The goal is simple:

Lose 8–16 lbs and up to 2 dress sizes in just 6 weeks while rebuilding your strength, energy, confidence, and healthy habits.*

All you need to commit to is 3 coached 45-minute workouts per week and follow our simple POP Nutrition Plan.

Your challenge includes:
✅ Results-driven coached workouts
✅ InBody Composition Scans
✅ Full POP Nutrition Plan
✅ PUSH 42 Challenge Tracker
✅ Coaching & UNBEATABLE ACCOUNTABILITY
✅ Private support group
🏆 $300 for the Challenge Winner

Never worked out before? PERFECT. Our workouts are beginner-friendly and can be modified for every fitness level.

🚨 LAST 2 SPOTS LEFT!

This is the LAST 2 DAYS to register.

No holds. No reserved spots. First come, first served.

Summer knocked you off track?
IT’S COMEBACK SEASON.

👇 CLAIM ONE OF THE FINAL 2 SPOTS NOW!
https://go.mjfitnessct.com/challenge-information

*Individual results vary based on starting point, participation, nutrition, and consistency.

🔥 PUSHING MY LIMITS IS MY DAILY RITUAL. 🔥The shirt says it all.At MJ Fitness, we’re here to push you, challenge you, and...
09/15/2026

🔥 PUSHING MY LIMITS IS MY DAILY RITUAL. 🔥

The shirt says it all.

At MJ Fitness, we’re here to push you, challenge you, and support you every step of the way. 💪

You bring the effort. We’ll bring the coaching, energy, and community to help you become stronger than you thought possible. 👊🔥

09/14/2026

🚨 LAST WEEK TO JOIN — ONLY 5 SPOTS LEFT!

Our 6-Week COMEBACK Challenge starts Monday, September 21st, and we are down to our FINAL 5 SPOTS!

Once those 5 are claimed, registration is CLOSED.

And remember — we lowered the price of this challenge to our LOWEST PRICE EVER.

🔥 YOUR 6-WEEK COMEBACK

The goal is simple:

Lose 8–16 lbs and up to 2 dress sizes in just 6 weeks while rebuilding your strength, energy, confidence, and healthy habits.*

All you need to commit to is 3 coached 45-minute workouts per week and follow our simple POP Nutrition Plan.

Your challenge includes:

✅ Results-driven coached workouts
✅ InBody Composition Scans
✅ Full POP Nutrition Plan
✅ PUSH 42 Challenge Tracker
✅ Coaching & UNBEATABLE ACCOUNTABILITY
✅ Private support group
🏆 $300 for the Challenge Winner

Never worked out before? PERFECT. Our workouts are beginner-friendly and can be modified for every fitness level.

🚨 ONLY 5 SPOTS LEFT!

This is the LAST WEEK to register.

No holds. No reserved spots. First come, first served.

Summer knocked you off track?

IT'S COMEBACK SEASON.

Don't wait until January to start working on yourself.

Your COMEBACK starts September 21st.

👇 CLAIM ONE OF THE FINAL 5 SPOTS NOW

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

Dedicated to your success,

— The MJ Fitness Team

*Individual results vary based on starting point, participation, nutrition, and consistency.

09/11/2026

❤️ This is what makes us happy to see!

Laury is working hard, getting results, and most importantly—enjoying the journey! 💪🔥

Seeing our members become stronger, more confident, and genuinely happy while reaching their goals is what MJ Fitness is all about.

Keep smiling, keep working, and keep crushing those goals, Laury! 👊❤️

Take a good look at this picture. Different people. Different ages. Different goals. Different stories.But they all have...
09/10/2026

Take a good look at this picture.

Different people. Different ages. Different goals. Different stories.

But they all have one thing in common: they decided to START.

Many began with our flagship 6-Week Challenge—nervous, out of shape, intimidated by the idea of walking into a gym, unsure if they could keep up, or simply ready for a change.

They reached out. They showed up. And they built MOMENTUM. 💪

There are no magic pills, gimmicks, or shortcuts at MJ Fitness. They put in the work—but they had a plan, coaching, accountability, nutrition guidance, and a community behind them.

For many, those first 6 weeks turned into months and years of becoming stronger, healthier, more confident, and doing things they once thought were impossible.

🔥 NOW IT COULD BE YOUR TURN.

Our 6-Week COMEBACK Challenge starts September 21st.

You don’t need to be fit or confident to start. That’s what we’re here for.

Your job? Take the first step and show up.

Six weeks won’t finish your story—but it could change how it begins. 💪🔥

Summer knocked you off track?
Don't wait until January. Your COMEBACK starts September 21st. 🔥

👇 Claim one of the last 11 spots before registration closes.
https://go.mjfitnessct.com/challenge-information

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

09/08/2026

🔥 Labor Day weekend is OVER… time to get back to WORK! 💪

No more excuses. No more waiting. Total Strength crew came ready to lift, sweat, and get stronger!

Back to the routine. Back to consistency. Back to RESULTS. 👊🔥

Ready to get stronger? Message us and start TODAY! 💪

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.

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

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