When one oscillates without tension magic is born. There’s nothing like watching Hatsumi Sensei, his tensionless action is spectacular and of great beauty. There are two terms we must consider in the training of our martial art; one of them is KIHON and the other HENKA. From my perspective these are much more than mere technical terms, they posses by themselves a very deep meaning that can be used for our own life and not only in the dojo.