When I was training in martial arts, we repeated certain techniques – holds, locks, chokes, throws, punches, kicks, et cetera – over and over again. The reasoning was simple: the longer we repeated a motion, the more engrained it became. When we sparred or grappled, those motions became automatic. We suddenly had our opponent in a lock or choke because our muscles remembered what our brains sometimes forgot in the moment of an adrenaline rush.