A single wrist grab in Aikido is easily defended against with the Nikyo technique. Learn this ancient Aikido self defense move from a martial arts expert in this free video clip and be prepared. Expert: Fred Mastison Bio: Mastison Sensei is an inductee into the United States Martial Arts hall of fame and is a 5th degree black belt who has been active in the martial arts for over 35 years. Filmmaker: Dustin Daniels