The Grandmaster's book of Ninja training

Dr. Masaaki Hatsumi
Here's another variation! The legs are the most important
the hands. Using the feet to pivot, Doron got both body
legs moving and turned the table on his opponent, gettin
all screwed up! See? You don't need any strength at all!
Don't just use the sword to cut: the legs and feet—and t
body with them—have got to move so that if the oppone
shifts he gets cut.
oint in trying to grab with the hands alone. Doron
the attacker's arms, and his left foot is positioned
any movement of either of his attacker's feet—the
ing from the movement of the whole body.