Look, Honestly, I did the SINE WAVE for 10+ years. It is useless. I met spoke with a real close friend(Grandmaster Kim Bok Man) of General Choi and he stated that he thought that sine wave was useless. He approached the General before his passing and and told him. General Choi agreed with him and wanted to revert, take out, the Sinewave technique out of Taekwondo. But the ITF and other related federations were too big and indoctrinated, and basically to late to change because of General Choi's I'llness at that time. If you don't believe me look up Master Kim Bok Man. He is basically one of the handful surviving members of original Korean Martial Art and it's transformation into Tae Kwon Do in the late 40's to 50's. Taekwon!