NMA is full contact fighting using any means necessary to beat your opponent. I think head-butting, eye-gouging, hair-pulling, biting, fish-hooking, and attacking the groin are illegal moves. Strikes to the back of the head, spine and kidneys are all illegal, as are strikes to the trachea. Intentionally throwing your opponent out of the ring/cage or leaving the ring/cage yourself is not allowed, nor is grabbing the ring rope or cage fence.