Take the 2-minute tour ×  Many ITF-based taekwondo practitioners
come to notice a difference between different ITF-based
organizations with some groups teaching a direct, forceful style
and others teaching a more timed, flowing style often referred
to as a "sine wave" style. What are the defining characteristics
of this "sine wave" approach to ITF hyungs/tuls and how did this
style originate?  share|improve this question  2 Answers 2  up
vote 3 down vote accepted  By reading the The Encyclopedia of
Taekwon-do written by General Choi Hong Hi, the founder of
Taekwon-do, one would find out that the sine-wave is a main
characteristic of Taekwon-do and is part of the "Theory of
power" that characterizes the style.  The sine-wave emphasizes
relaxation on the upward motion and the contraction and
explosion on the downward(final) motion. This allows you to put
the weight of your body into the technique.  You can read more
about the theory of power here:
http://www.saskgtf.com/theory.html  Also the differences you see