| Monday | 9–10 AM, 5–8:30 PM |
| Tuesday | 9–10 AM, 4:30–8:30 PM |
| Wednesday | 9–10 AM, 5–8:30 PM |
| Thursday | 9–10 AM, 4:30–8:30 PM |
| Friday | 9–10 AM, 5–7 PM |
| Saturday | 10 AM–12 PM |
| Sunday | Closed |
Mixed Martial Arts Underground is an independent kickboxing studio in Crystal Lake, IL. The studio is known for its hardcore, community vibe. They offer 3 class types including Mixed Martial Arts, Fitness, Jujutsu.
Data last verified: 2026-03-15
Own this studio? Email jess.park@sweatlocal.net to update your listing