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Keeping your head level is so un-natural & to me represses or takes away from fluid movement & the generation of power.

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While I would agree with you that working to keep your head level would be an unnatural movement (or lack of movement) in most cases, I can not agree that it takes away from the generation of power, exclusively. It would during downward blocks or strikes where the up and down body motion would add force and acceleration. But it would not be likely to detract from most forward motions, be they kicks, punches, blocks, etc.

I think both sides of this debate are taking it a bit too far at times. Sine wave, flat line, whatever... just as we debate within the art of TKD, other arts generate equal power through their own means and approaches. There is more than one way to reach the finish line. It's hard to sell people on why one is better. It's just about how somebody has taught you. When it comes down to it, TDK-X is not going to be any less dangerous in a fighting or sparring situaiton simply because he didn't learn sinewave.
Just my .02 !

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My .02. When I hosted Nam Tae Hi, he was not happy with those of us doing SW and preferred my guests who were progeny of Han Cha Kyon who were flat line. So, while one cannot establish percentages, if you are not doing SW you most likely have strong roots to the early kwans whose instructors were recruited by General Choi, but who never updated their technique to conform with Gneral Chois' methodology which in the early days was referred to as spring style and later sine wave. Even the early books refer to flexing the knees. General Choi mentions that the need to recruit and dispatch instructors in the early days limited his time with instructors and superseded the need to conform everyone's technique.

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thanks guys for the less sharp replies, which i appreciate as much as the sharp ones . to address the roots of our system, we practice han moo kwan style. the founder of our federation was taught be Kyo Yoon Lee. i believe the "official" han moo kwan now follows the kukkiwon curriculum. before the foundation of our federation, our president's school was with the ATA while it still practiced the chang hon tuls/hyungs/whateveryouwannacallem. if i ever get a chance to sit down and talk to GM i'll ask him about our system's origins. He also has a 9th dan under the kukkiwon. there is a whole range of influences that would probably explain why we do not do SW.

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Keeping your head level is so un-natural & to me represses or takes away from fluid movement & the generation of power.

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But it would not be likely to detract from most forward motions, be they kicks, punches, blocks, etc.

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A straight punch... a mid-block... a turning kick to name a few.
I don't do it, I grew up with sine wave. But in many motions like these, power contributors can include hip twisting, chambering, acceleration, countermovement, etc. An up down motion is moot.
Maintaining the same head level in movements like these would not necessarily reduce power in my opinion. It's not the way I train, but I just can't go ahead and say doing it this way would reduce power, since there are so many factors that generate power, both in the individual person and in the movement.

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