sine wave is wrong & is more akin to the saw tooth wave! This ITF instructor further states " General Choi has taken his variation of this idea and labelled it 'sine wave.' But he did not come up with this type of movement. I actually tell my students this and the ones who train with other ITF instructors always suffer apoplexy!", he also goes onto say "Examples of similar ideas to sine wave are in wing chun, Ed Parkers kenpo (he has his own term for it 'the marriage of gravity' )and of course people like DSI are talking about 'the wave form' as a 'player to the game.' If you get a chance to check out the much advertised martial arts & fitness video 'power punching' the theory put forward is also a similar idea to the sine wave. "! All good food for thought! There are more points to note here: As I said previously, sine-wave was not 'pushed' until recent years, however, a slight dropping of body weight into techniques has been. This is not the same as the 'bobbing' motion (as it has been described) that is so overly emphasised in sine-wave based patterns now-a-days. Further more, if you look at good original pattern practitioners/original masters you will notice a slight drop into techniques anyway, a natural motion that develops through training, whether emphasised or not, which is more in-line with the original sine-wave concept introduced in 1983. I think instructors are over-emphasising the actual