Nihon Sumo Kyokai Kounin - Nippon Oozumou Kakutouhen Japan

Sumo is a competitive full-contact sport where a wrestler (rikishi) attempts to force another wrestler out of a circular ring (dohyo) or to touch the ground with anything other than the soles of the feet. The sport originated in Japan, the only country where it is practiced professionally. It is generally considered to be a gendai budo (a modern Japanese martial art), though this definition is incorrect as the sport has a history spanning many centuries.