Sankyo Undo, an Aikido exercise, stretches the hand to prepare for Aikido techniques. Learn how to do Sankyo Undo to stretch your hand joints in this free Aikido training video featuring a 4th degree black belt. Expert: Gary Boaz Bio: Gary Boaz has been training in Aikido for 17 years, he is a 4th degree black belt under Fred Mastision Sensei of Aikido of Phoenix. Gary teaches Aikido, Kyusho-Jitsu, and Brazilian Jiu-Jitsu. Filmmaker: Dustin Daniels