An armlock in grappling is a joint lock that targets the elbow or shoulder, potentially causing hyperextension, hyperflexion, or hyperrotation. A variant, the armpit lock, is useful for immobilization and pinning. Armbars, like the traditional armbar and others, hyperextend the elbow. Armcoils, such as the Americana and Kimura, hyperrotate the arm, affecting the shoulder and/or elbow joint depending on flexibility. These techniques are central to grappling disciplines and can be highly effective submission holds.
1924: Robin Reed wins Olympic gold medal
In 1924, Robin Reed used the double wristlock to force pins on his way to an Olympic gold medal.
1928: NCAA rulebook on double wristlock
In 1928, the National Collegiate Athletic Association rulebook addressed concerns about the danger of the double wristlock, noting that if it is brought up to a twisting hammerlock, it becomes an illegal hold and must be stopped by the Referee.
1955: Tsunetane Oda demonstrates double wristlock
In 1955, Tsunetane Oda, a judo groundwork specialist who died that year, was shown on video demonstrating the double wristlock technique.
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