Black belt Jay Dunbar using Iron Palm technique does a very difficult break. Here he uses the back of his hand in what is called a back hand slap to penetrate through a 1” duct taped phone book to break a 2” thick concrete patio block. Notice that he is not using hip torque, or a drop of body weight. He simply drops the back of his bare hand on the phone book and transfers the power through the book into the brick. This is the power of Iron Palm as done in Waga-Michi Shorei Kempo.
