Aikido
Aikido was a Human art of self-defense that originated in Japan. This martial art used holds and locks, and taught the principles of nonresistance to debilitate the strength of an opponent.

Hoshi Sato held a black belt in aikido. ()

Security chief Natasha Yar was trained in aikido and demonstrated this in a holographic program to the Ligonians Lutan and Hagon on the holodeck. () Three days before her death, Yar was scheduled to participate in a martial arts competition with Science Officer  and Lieutenant Minnerly. She was favored in the ship's pool. ()

External link 
 

de:Aikido
Earth
Martial arts