#4 Silat

Silat is rather unheard of yet lethal form of Martial arts. Originating in Indonesia, it's said to have its roots from Indian and Chinese forms of combat, though it's just an unconfirmed theory, and the origins of the sport aren't too well-known. With that said, it focuses primarily on speed, leverage and disabling maneuvers.
The foot stances are something that can definitely revolutionize MMA, as the discipline has a wide array of foot stances. These stances are often drilled in for hours on end. In competition itself, it focuses on body shots overhead shots, and holding the opponent down and rendering them helpless means more points.
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#3 Kapu Kuialua

Kapu Kuialua is an unlikely Hawaiian Martial art that was forbidden to regular people for a period of time. It was brought back in 1920 and officially began to be taught in 1963. The fundamentals of Kapu Kuialua is about breaking bones and manipulating whatever joints are vulnerable.
Again, we'd like to emphasize that we don't encourage breaking bones, but joint manipulation can play a key part in victory for an MMA fighter, and would definitely provide helpful tools for the fighters.