|Taekwondo Bible, Vol.2||
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.