MMA Underground

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MMA Underground MMA, Kettlebells, and full-body conditioning MMA UNDERGROUND INC. Along with kettlebell and Xtreme Cage Fighter Workout classes
(498)

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 fighting readiness, if the drive to succeed is there. So, he fuel this drive in a spacious Mixed Martial Arts facility, where clients will find a padded floor, hanging bags, and dummies waiting to punched, kicked, and jabbed during group classes or personal training sessions.

THE JAPANESE SECRETS
10/03/2026

THE JAPANESE SECRETS

🥊 TEAM UNDERGROUND, WE DID IT AGAIN!Look at this picture. Take a look at the belts held high and the family standing tog...
09/30/2026

🥊 TEAM UNDERGROUND, WE DID IT AGAIN!

Look at this picture. Take a look at the belts held high and the family standing together on these red mats. This photo is the perfect proof of our core truth: champions aren't born; they are built from scratch right here.

Tonight, we honor three incredible men who poured everything into this team:

• 🥇 Coach Dylan: From a dedicated student 20 years ago to the brilliant mastermind in our corner today. Your fight IQ guides our warriors through the storm, and we are incredibly proud of the leader and man you’ve become.

• 🥇 Golden Gloves Champion Angel: You started from nothing and earned every inch of that belt. It represents every round you finished when your lungs were burning and every sacrifice made in the dark.

• 🥇 Junior Olympic Champion Jose: At just 16 years old with a 6-1 record, your 5-day-a-week dedication sets the standard. You achieved greatness early, but stay hungry—the sky is the limit.

To the rest of the team standing shoulder-to-shoulder in this room: nobody holds a belt alone. You held the pads, pushed the pace, and built the brotherhood that makes this gym a family. We don't just build fighters; we build character, discipline, and respect.

Let’s celebrate these victories tonight, and tomorrow, we get right back to work.

🥊 KEEP TRAINING. KEEP FIGHTING. KEEP BUILDING.

13

🥊 WARRIORS: THE PATH TO EXCELLENCE🥊 Young warriors, understand this:YOUR FUTURE IS BEING BUILT BY THE CHOICES YOU MAKE T...
09/29/2026

🥊 WARRIORS: THE PATH TO EXCELLENCE🥊

Young warriors, understand this:
YOUR FUTURE IS BEING BUILT BY THE CHOICES YOU MAKE TODAY.
The world will offer you shortcuts. It will offer distractions, excuses, and people who tell you that discipline doesn't matter.
Don't listen.

EXCELLENCE HAS NO SHORTCUT.

If you want to become strong, train your body.
If you want to become capable, train your mind.
If you want success, develop discipline.
If you want respect, earn it through your actions.

Choose friends who push you forward—not people who pull you backward.

Choose the gym over the streets.
Choose knowledge over ignorance.
Choose hard work over excuses.
Choose character over popularity.
Choose your future over temporary pleasure.
You don't have to be perfect.

YOU HAVE TO KEEP IMPROVING.
Every workout.
Every class.
Every mistake.
Every setback.
Learn from it. Get back up. Keep moving.

Remember:
THE LIFE YOU WANT WILL NOT BE GIVEN TO YOU.
YOU MUST BUILD IT.

Your path belongs to you.
Walk it with DISCIPLINE.
Walk it with COURAGE.
Walk it with HONOR.
And never stop becoming the person you were capable of being.

THE WARRIOR'S PATH IS NOT ABOUT BEING BETTER THAN EVERYONE ELSE.

IT IS ABOUT BECOMING BETTER THAN YOU WERE YESTERDAY.

🥊 TRAIN HARD. THINK STRONG. LIVE WITH PURPOSE.



13

THE PAST WAS NEVER WEAK.Every generation thinks it has discovered toughness. Every generation thinks its methods are mor...
09/29/2026

THE PAST WAS NEVER WEAK.

Every generation thinks it has discovered toughness. Every generation thinks its methods are more complete. And every generation eventually learns the same lesson:

TIME DOES NOT MAKE A MARTIAL ART WEAK.
IGNORANCE DOES.

The young warrior looks at traditional karate and sees old uniforms, old kata, old terminology, and techniques that appear disconnected from the chaos of modern combat. Then comes the question:

“Why not add MMA to make karate complete?”

But the master smiles, because the question itself reveals how little history we understand. Old Okinawan karate was never created to look beautiful. It was created to function.

Striking, kicking, clinch fighting, throws, takedowns, joint manipulation, grappling, close-quarter combat. The battlefield changed. The clothing changed. The rules changed. The vocabulary changed. But the human body did not.

A punch was still a punch.
A takedown was still a takedown.
A joint still broke the same way.
And pressure still exposed weakness.

MMA did not invent the truth. It built a modern arena where the truth could no longer hide. That is the difference. MMA forced martial artists to confront reality.

No choreography could save you. No belt could save you. No reputation could save you.

No beautiful technique mattered if you couldn't make it work against resistance. And that lesson should not insult traditional martial arts.

It should challenge them.

Because a real warrior does not protect a tradition by refusing to test it. He protects its value by putting it under pressure.

If it works—keep it.
If it fails—fix it.
If it has been forgotten—rediscover it.

If something from another system makes you stronger—learn it.

The ego says, “This is mine.”
The warrior says,
“Show me what works.”

That is why the greatest martial artist is not the man who knows the most techniques.

It is the man who understands the principles beneath them.
Distance, timing, balance, position, pressure, adaptation, awareness, control, and the willingness to keep learning after everyone else thinks you already know enough.

MMA did not necessarily replace karate. Perhaps it did something far more uncomfortable.

It forced martial artists to remember what martial arts were supposed to be about in the first place.

Not appearance, not tradition for tradition's sake, not belts, not titles, not applause, truth under pressure.

The cage is only a modern laboratory. The real battlefield has always been the same:

YOURSELF.

Your ego, your fear, your laziness, your assumptions, your attachment to being right.

A warrior who cannot defeat those things will eventually be defeated by something much smaller.

So respect the old masters, but do not worship them. Study the past, but do not live in it. Embrace the future, but do not become its prisoner.

TEST EVERYTHING.
QUESTION EVERYTHING.
TRAIN EVERYTHING.
MASTER YOURSELF.

Because the warrior's path was never about proving that one martial art is superior to another. It was about becoming difficult to defeat—especially by the weaknesses inside yourself.

MMA UNDERGROUND

NO EGO.
NO EXCUSES.
NO SHORTCUTS.
JUST THE WORK.



13

🥊 WARRIORS:We Won Two BeltsTonight is not just about three victories.Tonight is about THREE JOURNEYS.Three different sto...
09/27/2026

🥊 WARRIORS:

We Won Two Belts

Tonight is not just about three victories.
Tonight is about THREE JOURNEYS.
Three different stories.
Three people who started from different places, faced different challenges, and walked different roads.
But they all discovered the same truth:
CHAMPIONS ARE NOT BORN.
CHAMPIONS ARE BUILT.

🥇 FIRST — SENSEI DYLAN

Almost 20 years ago, I started training a young man named Dylan.
I watched him walk through the doors as a student.
I watched him struggle.
I watched him learn.
I watched him fall and get back up.
Year after year, I watched him grow.
Today, I don't just see the student I once trained.
I see a SENSEI.
I see a COACH.
I see a man who now takes everything he learned and passes it on to the next generation.

Dylan doesn't just know how to fight.

HE KNOWS HOW TO BUILD FIGHTERS.

His fighting IQ is incredible.
When he stands in the corner, he sees things other people don't see.
Sometimes, he can recognize what is about to happen before it happens.
He reads the fight.
He sees the openings.
He understands the opponent.
And he knows how to guide his fighter through the storm.
That is what a true coach does.
A true coach doesn't fight the fight for you.

HE TEACHES YOU HOW TO FIND THE STRENGTH TO FIGHT IT YOURSELF.

Dylan, I am proud of the Sensei and Coach you have become.
But more importantly…
I AM PROUD OF THE MAN YOU HAVE BECOME.

🥇 SECOND — ANGEL

Angel started with us FROM SCRATCH.
No shortcuts.
No guarantees.
Just a young man willing to work.
There were difficult moments.
There were moments when things didn't go his way.
There were moments when he was at his lowest.
But Angel kept showing up.

HE KEPT TRAINING.
HE KEPT BELIEVING.
HE KEPT MOVING FORWARD.

That is what separates a champion from someone who simply wants to win.
A champion learns how to keep walking when the road gets hard.
Today, Angel stands as a GOLDEN GLOVES BOXING CHAMPION.
But that championship represents much more than a medal.
It represents every difficult day he refused to quit.
Every round he finished when he wanted to stop.
Every sacrifice nobody saw.
Angel, YOU EARNED THIS.
And remember…
This championship is not the end of your journey.
IT IS PROOF OF WHAT YOU ARE CAPABLE OF.
Keep going.
Keep working.
KEEP BECOMING THE CHAMPION YOU ARE CAPABLE OF BECOMING.

🥇 THIRD — JOSE

Jose walked through our doors when he was only 14 YEARS OLD.
Just a kid.
Today, at only 16, he is already a JUNIOR OLYMPIC BOXING CHAMPION.
His record is 6–1.
And he trains FIVE DAYS A WEEK.
At an age when many are looking for excuses…
Jose is looking for another day to train.
Another round.
Another lesson.
Another opportunity to improve.
That dedication is beginning to show.
Jose, you have already accomplished something special.
But don't let the championship make you satisfied.
LET IT MAKE YOU HUNGRY.
Keep your feet on the ground.
Keep your mind sharp.
Keep listening.
Keep learning.
Keep working.
Because Jose…
THE SKY IS THE LIMIT.
And I don't believe you're anywhere near your limit yet.

🔥 TEAM UNDERGROUND
When you see a champion standing with a medal around his neck…
HE IS NEVER REALLY STANDING ALONE.
Behind that champion are coaches.
Training partners.
Parents.
Families.
Friends.
People who stayed late.
People who showed up early.
People who held the pads.
People who pushed them through another round.
People who believed in them when they didn't believe in themselves.

That is TEAM UNDERGROUND.
That familyhood is part of what makes this place special.
Because here, we don't just train people to win fights.
WE BUILD CHARACTER.
We build discipline.
We build confidence.
We build responsibility.
We build people who understand that success comes from sacrifice.
And after all these years, I still believe in the principles that built this team.
DISCIPLINE.
RESPECT.
PATIENCE.
FUNDAMENTALS.
PERSEVERANCE.
HUMILITY.

These principles don't become outdated.
The sport changes.
Training methods evolve.
But the warrior's foundation remains the same.
And that is why…
After all these years…
WE ARE STILL MAKING CHAMPIONS FROM SCRATCH.
Not buying champions.
Not looking for shortcuts.
Not pretending success happens overnight.
We take ordinary people…
We teach them.
We challenge them.
We build their strengths.
We teach them to get back up.
And slowly…
day by day…
round by round…
year by year…
WE BUILD CHAMPIONS.
So tonight, Warriors…
Give a tremendous congratulations to:
🥇 SENSEI DYLAN
🥇 GOLDEN GLOVES CHAMPION ANGEL
🥇 JUNIOR OLYMPIC CHAMPION JOSE
And to every member of TEAM UNDERGROUND who helped them get there.
Be proud.
Not just because we won.
Be proud because we are continuing a tradition built on:
DISCIPLINE.
SACRIFICE.
RESPECT.
PERSEVERANCE.
The principles are still working.
The Warrior's Path is still alive.
And here at MMA UNDERGROUND…
WE ARE STILL MAKING CHAMPIONS FROM SCRATCH.
🥊 KEEP TRAINING.
🥊 KEEP FIGHTING.
🥊 KEEP BUILDING.
NEVER STOP BECOMING BETTER.

The Japanese secrets of fighting are still working—even in modern times.

09/26/2026

MMA UNDERGROUND SATURDAY SPARRING🥊

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-

2. THE MASTER'S PATH: The master's path is not an external chase for glory but an internal war. If you want to walk it, ...
09/24/2026

2. THE MASTER'S PATH:

The master's path is not an external chase for glory but an internal war. If you want to walk it, you must forge the warrior's mind: look inward and recognize that fear is natural; courage is moving forward anyway.

This journey demands absolute discipline: show up to the mats, be on time, and be ready to bleed. Do not rush to advanced tricks; master your fundamentals first, because balance comes before power. Without structural alignment, force is an illusion.

When violence meets reality, every weapon matters. In Boxing: keep your hands disciplined and your chin tucked—protection is your first and last line of defense. In Muay Thai: respect timing or get caught; speed means nothing if you strike at the wrong moment. In Wrestling: build a strong base so no one can tear you down—your connection to the earth dictates your survival. In Ju-Jutsu: seek control before attacking, for space is your enemy's only escape.
To survive the deep, exhausting waters of a real battle, you must embrace the suffering of conditioning and train your engine. Exhaustion is the ultimate destroyer of technique. Therefore, when you step up for sparring, leave your ego at the door—it will only get you knocked out. The gym is a laboratory for growth, not a theater for pride.

When you cross the line into real competition, never look down on the soul across from you; never underestimate your opponent. If the gods of combat test you and you taste defeat: shut up, look in the mirror, and don't make excuses. If you conquer the moment and claim victory: remain humble, stay classy, and deeply respect the person you defeated, for they were the mirror that proved your growth.

At the end of the day, plastic trophies break, and titles fade, but your character remains. Keep your word to yourself and to the world, and, like a true master of Karate, learn from everyone—even your enemies.



13

09/19/2026

MMA UNDERGROUND SATURDAY SPARRING🥊

SENSEI SAYS:COME TO MMA Underground AND ENJOY THREE FREE CLASSES1. MUAY THAI BAGS & PADS WORKOUT2. KIDS MMA3. BOXING4. K...
09/17/2026

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 JU-JUTSU
7. WRESTLING

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

-THE WAY OF THE WARRIOR-

-Jutsu

13

THE MASTER'S PATH: ⚡⏳Look inward. Control your mind before you attempt to control your opponent.This is the foundation o...
09/15/2026

THE MASTER'S PATH: ⚡⏳

Look inward. Control your mind before you attempt to control your opponent.

This is the foundation of the warrior’s mind, and it demands absolute discipline: you must show up, without excuse, day after day.

True mastery is a lifelong devotion to fundamentals. You must master the basics until they become as natural as breathing.

In the chaos of boxing, you protect yourself at all times. In the strategic spacing of Muay Thai, you respect distance. When locked in wrestling, you fight for position with unyielding will. And on the mats of Ju-Jutsu, you remember the eternal law: position before submission.

Never neglect your conditioning, for exhaustion is the enemy of skill—a tired fighter makes technical mistakes.

When sparring, silence your ego and spar to learn. When stepping into the fire of competition, you must respect every opponent, recognizing the shared sacrifice it took to stand across from you.

The battlefield of life will test your spirit. In the face of defeat, you must accept defeat with dignity, using the loss to forge a stronger soul. In the glory of victory, you must win with humility, understanding that triumph is fleeting.Look deep into your own character: you must be a good person before trying to become a great fighter.

The path has no end. Like the deeper truth of Karate, you must never stop being a student of the art, and a student of life. 🥋🔥

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

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