ガマク
Gamaku
Iliopsoas

 

 
Gamaku is the Uchinaaguchi (Okinawan/Shuri dialect) term for the iliopsoas muscle (iliacus, psoas major, psoas minor), which is key to the use of the legs, hips and lower back in generatingthe whipping action of Okinawan karate (Dan Smith Hanshi).
 

 

A Japanese karate analysis of gamaku