Sumo (相撲, sumō, lit. "striking one another") is a form of competitive full-contact wrestling where a rikishi (wrestler) attempts to force his opponent out of a circular ring (dohyō) or into touching the ground with any body part other than the soles of his feet (usually by throwing, shoving or pushing him down). The sport originated in Japan, the only country where it is practiced professionally. It is considered …