The compound gym is not only San Diego's largest mixed martial arts and cross training facility, but it's also North County's first MMA gym in the history of the county. With the best staff, best amenities, best layout, and busiest intersection in North County San Diego it's no wonder why the compound is where all the real serious people choose to train. Classes and Training Available: Boxing, Muay Thai, Jiu Jitsu, Kickboxing, Strength and Conditioning, High Intensity Training, Kids Training. The Compound MMA gym is open 24 Hours.