13th Chamber Fight Club is the place to train if you're looking for elite BJJ and combat grappling instruction whether here in Oklahoma or traveling through and looking for a gym or open mat. I've been with Coach Bill and Coach Bethany for nearly six years, and I couldn't recommend them more. Coach Bill teaches with a practical, real-world approach that's effective for both competition and self-defense, while both coaches create a supportive and ego-free environment where everyone can improve. What truly sets this gym apart is its culture—people of all ages, experience levels, and fitness backgrounds are encouraged to learn, grow, and push each other to be better. After nearly six years, I can confidently say this is a gym you'll want to call home for the long haul.
Step outside the ordinary.
You feel it the moment you walk in. The people here train hard, expect your best, and have your back from day one.
We build each other up and challenge each other to be better. Every improvement, yours or a teammate's, is a shared victory.
Build. Grow. Learn. Together.
Four pillars shape how you train, how you treat your teammates, and who you become on the mat.
of dedicated martial arts experience.
✦Discipline
You show up. You put in the work. You do what others won't.
✦Respect
For yourself, your teammates, your coaches, and the art.
✦Unity
We train together. We learn together. We win together.
✦Growth
You embrace the grind and grow stronger through every challenge.
Why thirteen?
Most places have a set number of rooms. The 13th is the one past them, a hidden chamber for those willing to go further than everyone else.
The next level
A step past ordinary training, where the real work starts.
Tested, mind and body
You get pushed mentally and physically, every round.
An inner circle
Not a crowd. A tight-knit team that trains as one.
Earned in hardship
Discipline you can't buy or fake. You earn it the hard way.
- The nerve to go against the grain.
- A team that becomes family.
- A standard only a few will ever meet.
No secrets, no titles. Just showing up, doing the work, and earning trust through your actions. You're not just a member. You're part of something real.
Step inside. Earn your place. Become part of the Chamber.
Straight from the mats.
Fantastic training culture, Bill has an incredible ethos and instruction method. Going here will make you a great grappler and a better person.
Great environment, positive energy and GREAT LEADERS. Our coaches Bill, Bethany are TRUE Leaders, Teachers and students of the Art. When people think of Oklahoma, Think 13th Chamber Fight Club! 💯