Since the beginning of time, men have engaged in hand-to-hand combat. In Ancient Greece, they called it Pankration, a no-holds-barred battle. Over time, one complete combat system was replaced by a variety of limited ones like karate, boxing, and wrestling. In the modern age this created an eternal question: who was tougher? Could a boxer beat a wrestler? Could a kung fu artist dispose of a jiu jitsu man?