MMA Underground

MMA Underground

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MMA, Kettlebells, and full-body conditioning MMA UNDERGROUND INC. Along with kettlebell and Xtreme Cage Fighter Workout classes

is a training ground and fitness facilty for students who want to get into the best possible physical shape. The center is helmed by head coach Oscar Olivares Sensei, who brings with him a long list of achievements and venerable lineages in both stand-up fighting and ground fighting. Oscar Sensei believes that anyone can achieve their fitness goals, be they weight loss, muscle gain, or competitive

07/30/2026

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Sensei Says:

WARRIORS WANTED.

Comfort never built a fighter.

Our No-Gi Ju-Jutsu team is growing, and we're looking for people ready to push their limits.

🔥 Learn to dominate the ground.
🔥 Build relentless conditioning.
🔥 Develop real confidence through real training.
🔥 Train side by side with champions.

No excuses. No shortcuts. Just hard work, discipline, and the will to improve every time you step on the mat.

Claim your 3 FREE classes and prove to yourself what you're made of.

Don't watch champions. Train with them. Become one.

07/30/2026

Sensei Says:

WARRIORS WANTED.

Comfort never built a fighter.

Our No-Gi Ju-Jutsu team is growing, and we're looking for people ready to push their limits.

🔥 Learn to dominate the ground.
🔥 Build relentless conditioning.
🔥 Develop real confidence through real training.
🔥 Train side by side with champions.

No excuses. No shortcuts. Just hard work, discipline, and the will to improve every time you step on the mat.

Claim your 3 FREE classes and prove to yourself what you're made of.

Don't watch champions. Train with them. Become one.

Photos from MMA Underground's post 07/29/2026

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Sensei Says:
Celebrating with the Champion at home

07/26/2026

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Warriors:

If you couldn't make it out to support Jose yesterday, we've got you covered—here's his full fight.

Make sure you don't miss his next one. Jose always brings the action and leaves it all in the ring!

07/26/2026

Warriors:

If you couldn't make it out to support Jose yesterday, we've got you covered—here's his full fight.

Make sure you don't miss his next one. Jose always brings the action and leaves it all in the ring!

Photos from MMA Underground's post 07/26/2026

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🥊 Another dominant performance by Jose! 🥊
Congratulations to Jose on yet another incredible victory by TKO! Your discipline, dedication, and relentless work ethic continue to pay off every time you step into the ring. You represented yourself, your team, and everyone who believes in you with heart and determination.
A special congratulations to Coach Dylan for another outstanding job in the corner. Your calm leadership, smart strategy, and experience guided Jose every step of the way and played a huge role in this victory.
Finally, a heartfelt thank you to all of Jose’s teammates and sparring partners. Champions are never built alone. Every round you pushed, every lesson you shared, and every sacrifice you made in the gym helped prepare Jose for this moment. This victory belongs to the entire team.
The hard work continues—one fight at a time, one victory at a time. On to the next! 🥊🏆💪

07/25/2026

🥊 Another dominant performance by Jose! 🥊
Congratulations to Jose on yet another incredible victory by TKO! Your discipline, dedication, and relentless work ethic continue to pay off every time you step into the ring. You represented yourself, your team, and everyone who believes in you with heart and determination.
A special congratulations to Coach Dylan for another outstanding job in the corner. Your calm leadership, smart strategy, and experience guided Jose every step of the way and played a huge role in this victory.
Finally, a heartfelt thank you to all of Jose's teammates and sparring partners. Champions are never built alone. Every round you pushed, every lesson you shared, and every sacrifice you made in the gym helped prepare Jose for this moment. This victory belongs to the entire team.
The hard work continues—one fight at a time, one victory at a time. On to the next! 🥊🏆💪

07/19/2026

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SENSEI SAYS:

COME TO MMA Underground AND ENJOY THREE FREE CLASSES

1. MUAY THAI BAGS & PADS WORKOUT
2. KIDS MMA
3. BOXING
4. KETTLEBELL STRENGTH TRAINING
5. MMA STAND-UP FIGHTING
6. NO-GI JUJUTSU
7. WRESTLING

FOR THE CLASS SCHEDULE, CLICK ON THE LINK
https://mmaunderground.info/class-schedule

-THE WAY OF THE WARRIOR-

07/19/2026

SENSEI SAYS:

COME TO MMA Underground AND ENJOY THREE FREE CLASSES

1. MUAY THAI BAGS & PADS WORKOUT
2. KIDS MMA
3. BOXING
4. KETTLEBELL STRENGTH TRAINING
5. MMA STAND-UP FIGHTING
6. NO-GI JUJUTSU
7. WRESTLING

FOR THE CLASS SCHEDULE, CLICK ON THE LINK
https://mmaunderground.info/class-schedule

-THE WAY OF THE WARRIOR-



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Location

Address


835 Virginia Road Ste C
Crystal Lake, IL
60014

Opening Hours

Monday 9am - 10am
5pm - 8:30pm
Tuesday 9am - 10am
5pm - 8:30pm
Wednesday 9am - 10am
5pm - 8:30pm
Thursday 9am - 10am
5pm - 8:30pm
Friday 9am - 10am
5pm - 8:30pm
Saturday 10am - 1pm