Concerned with the posture of waist, it is Haneul to
straighten your upper body up with your waist twisted. Why is it so?
You should straighten your upper body up because it is
same as man's standing posture. You can make the most natural posture based
on the daily usual pose. This is verily the mediocrity of Nature. Therefore
it is the way of Haneul.
On the other hand, you should keep your waist twisted
because it can contain change in it. If you get naturality you should put a
tension that keeps the naturality going on under it. Thus, the change of nature
never stops, and the motion of Taekwondo, which follows the way of Haneul, never
get exhausted likewise. Therefore it is the way of Haneul to twist your waist.