Brazilian Jiu Jitsu

Fact: 90% of all fights enter the grappling range at some point, and most go to the ground...If you cannot defend yourself on the ground, then you cannot defend yourself!

Hi my name is Professor Will Grundhauser and I received my Black Belt directly under Master Sylvio Behring of the Legendary Behring Family and Currently I am training Directly under Bernardo Faria 5X IBJJF Blackbelt World Champion (Alliance BJJ) . I want you to come try Brazilian Jiu Jitsu (BJJ) at my academy so that you can defend yourself when it counts, when your life depends on it! Where do almost all altercations end up? The Answer is on the GROUND or at least in a clinch/grappling range of combat. It's simple, if you don't know what to do when somebody takes you down, you may be hurt or even worse... I have studied Martial Arts for over a Decade now, I have a Black Belt in BJJ, I have fought in the cage successfully as a Professional, I have trained Boxing, Muay Thai, Kickboxing, Judo. I have tried it all. All of the Arts are valuable to know, but without a doubt Brazilian Jiu Jitsu is a "MUST KNOW" if you are serious about defending yourself or even possibly saving your life if you are ever attacked!  

There is no better place in Montana to come and learn Brazilian Jiu Jitsu than the Grindhouse. I have trained and studied with the BEST in every aspect of BJJ. Being Directly under Master Sylvio Behring and now Bernardo Faria both have given me tremendous opportunities and experience to work with some of the best people in the world. I want to pass that knowledge on to you. Just come on down and give us a try or message me in the CONTACT US tab. 

OH...and if you have no experience, no problem. We have the most incredible beginner-friendly program in the State. You will not be "Thrown to the Wolves" so to speak. Instead you will be guided step by step towards ultimate self-improvement in both the Martial Arts and fulfilling your fitness goals! Just give us a try. We will set up an appointment with you, see what is important to you and do our best to guide you in the direction that meets your needs. 


Although BJJ is the choice Martial Art when it comes to ground fighting for nearly all high level Mixed Martial Artists, you don't have to be a competitor to really enjoy the benefits of training Brazilian Jiu Jitsu...

​It does not matter if you are old or young, if you are big and looking to loose weight or small and looking to build doesnt matter if you are male or female...or even if you want to compete or not...In shape or wanting to get into shape...All Are Welcome!

As a matter of fact there are all kinds of people right here in Billings, Montana discovering the benefits of BJJ training at The Grindhouse, and if you haven't checked it out for yourself yet, then, well, you are missing out big time. Because while BJJ will teach you how to defend yourself once a fight gets in the grappling range or on the ground, it also gets you in great shape, builds strength and flexibility, and is amazingly FUN too!


MMA (Mixed Martial Arts)

Our MMA Program is designed to mix the skills from our Jiu Jitsu, Muay Thai, and Boxing Programs into a complete fighting style. 

This program is for people who have already learned multiple fighting styles and are looking to advance to the next level of both physical and mental training. We will teach you to transition between Striking Arts and Grappling Arts to form a complete Fighting Style. We offer opportunity to compete in the cage once you have proven yourself in our training style. This program is High Paced and NO LOVE from our coaching staff. Not for the faint of heart. 



Boxing is a fundamental fighting style that everyone should know.

In addition to intangible traits, the sport can also make a huge difference in participants' health and fitness. Boxers are among the fittest athletes in the world, and it's no wonder. Because boxing combines quickness, agility, strength, and stamina, peak physical fitness is crucial to success.

Muay Thai

​Ludwig's BANG Muay Thai system (or BMT) is a rigorously developed muay thai system created by Ludwig himself. A system created by one of the most technical strikers in MMA.

Our Head Muay Thai instructor is Undefeated Pro Fighter John "Roadhouse" Colter. This program focuses on fundamental striking techniques, footwork, defense, clinch, and unbelievable striking combinations that are being applied at the highest levels in our sport. This is a great place for anyone who is looking to improve cardio, relieve stress, gain real world self defense skills, and to have fun while learning a great Martial Art. The BANG program is designed for people of all skill levels from Pro Fighters to housewives. 

Lil Grinders kids class

Ages 4-7 We Focus on BJJ, Muay Thai, FUN AND LEARNING THROUGH GAMES.



If you are thinking about getting your child involved in Martial Arts, then you are going to love what I am about to share with you. 

Here is Why...

If I told you there is a proven youth Martial Arts Program in your area that can help your child increase Self-Esteem, Improve Behavior, Get in Great Shape, have Fun while learning Self-Defense and Life Skills, become more Focused and Lots More, would you be Interested? 

​If your Answer is "YES," Then I would like to tell you about our Lil Grinders Kids Martial Arts Program that has a lot of parents in the Billings Area raving about the positive benefits our program has to offer them and their children.  

"What Can Martial Arts Give My Child That Other Activities Can Not?"

That is a question we get all of the time from concerned Parents. Our answer is simple. We have a specific program designed for kids, that teaches a variety of "Life Skills." Focuses on "Character Building" not just flashy punches and kicks you might see in the movies. 

The Physical skills and attributes your child will develop will continually improve because our system is ongoing, not "Seasonal" like most Sports. Our system is about a lifestyle, one that makes kids better people overall, on the mats and off the mats, We develop Champions for Life.