Kyokushin
Under the WKO knockdown rules a bout is won by downing the opponent, the hand or elbow to the face or neck is a foul, and grabbing, holding and throwing are fouls too. What the format trains, relentlessly, is the thing Krav Maga programmes do not: repeated full-contact exchange, bare-handed, against one opponent, for minutes. There is no knife in a Kyokushin bout and no second attacker. There is, every week, someone hitting you to the body as hard as they can.