Sumo is a style of wrestling and is the national sport of Japan. A sumo match takes place on a platform called a dohyō, which is a 6.7 square meter platform with a 4.55 meter ring. Dohyō were first built in temples and believed to be where a god resided. During the match, both wrestlers must stay inside the ring and the first one to step out of the ring, or allow any part of his body to touch the ground except the soles of his feet, loses the match.
