Sumo - sumo tradition is an old one; every match is accompanied by numerous rituals in a dohyo - the ring made of clay mixed with sand. Sumo prohibits punching, suffocating holds, grasping the hair, ears, fingers, and the mawashi, a belt that covers the genitalia. Sumo allows slapping (harite), pushing, seizing illegal body parts and belts, thrusting at an opponent’s throat (nodowa), as well as throwing, tripping and grappling. The bout begins with a simultaneous spurt of fighters followed by a clash (tachi-ai). Offensive fight is considered as successful tactics and a good practice.