About this gym
The Grindhouse is a martial arts gym in Billings, Montana founded by Will Grundhauser, a 5th generation Montanan, U.S. Navy veteran, and 3rd degree BJJ blackbelt. The gym offers Jiu Jitsu (Gi and No-Gi), Muay Thai, Boxing, and MMA programming for hobbyists and competitors alike, plus a dedicated kids program that is the gym's largest offering. Grindhouse fighters have won championships in MMA, jiu jitsu, and boxing across multiple promotions.
Classes offered
Class schedule
- Drop-in OKOpen Mat12:00 PM–2:00 PM
- Drop-in OKOpen Mat12:00 PM–2:00 PM
- Drop-in OKKids No-Gi Jiu Jitsu4:00 PM–5:00 PM
- Drop-in OKAdult Gi Jiu Jitsu5:00 PM–6:00 PM
- Drop-in OKBoxing6:00 PM–7:00 PM
- Drop-in OKMMA/Muay Thai7:00 PM–8:00 PM
- Drop-in OKOpen Mat12:00 PM–2:00 PM
- Drop-in OKKids Gi Jiu Jitsu4:00 PM–5:00 PM
- Drop-in OKAdult Gi Jiu Jitsu5:00 PM–6:00 PM
- Drop-in OKBoxing6:00 PM–7:00 PM
- Drop-in OKAdult No-Gi Jiu Jitsu7:00 PM–8:00 PM
- Drop-in OKOpen Mat12:00 PM–2:00 PM
- Drop-in OKKids MMA Striking4:00 PM–5:00 PM
- Drop-in OKAdult Gi Jiu Jitsu5:00 PM–6:00 PM
- Drop-in OKAdult No-Gi Jiu Jitsu6:00 PM–7:00 PM
- Drop-in OKMuay Thai7:00 PM–8:00 PM
- Drop-in OKOpen Mat12:00 PM–2:00 PM
- Drop-in OKAdult No-Gi Jiu Jitsu5:00 PM–6:00 PM
- Drop-in OKAdult No-Gi Jiu Jitsu6:00 PM–7:00 PM
- Drop-in OKMMA7:00 PM–8:00 PM
- Drop-in OKOpen Mat12:00 PM–2:00 PM
- Drop-in OKAdult Gi Jiu Jitsu5:00 PM–6:00 PM
- Drop-in OKAdult Gi Jiu Jitsu6:00 PM–7:00 PM
- Drop-in OKOpen Mat12:00 PM–2:00 PM
Membership & pricing
Monthly Membership
All classes are included in a monthly membership. Family memberships are available for households with multiple members training.
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