Anbo-Jitsu

Anbo-Jitsu (also known anbo-jytsu) as is a fictitious sport shown in Star Trek: The Next Generation. In it, two armored opponents face each wear a solid visor, rendering them blind, and fight with a large staff. A proximity sensor is worn by each combatant, alerting them to their opponent's location with an audio signal. A protective cushion is worn on one arm and can be used to shield or deflect attacks.

Will Riker and his father settled a long-standing grudge with this game in Star Trek the Next Generation's episode, The Icarus Factor.