Masahiko Kimura is a famous practitioner of Judo who challenged Helio Gracie to an exhibition match in in Rio de Janeiro, Brazil in 1951. During the match, Masahiko Kimura broke Helio Gracie's arm with a technique in Judo known as "gyaku ude-garami", or reverse double wrist-lock. Helio Gracie did not concede, those his corner threw in the towel to signal the match to stop. Thereafter, the technique Kimura used has come to be prominently known as the Kimura in Brazilian Jiu-Jitsu.