Question 062: Sine wave

I have studied Taekwondo Chung Do Kwan for about 13 years. We usually generate power by twisting the hips into the technique. I recently began studying at an ITF school where the sine wave is also incorporated as part of generating power and is supposed to be a natural motion of the body. I think the ITF's theory of the sign wave is a little over exaggerated when compared to natural movement. From a traditional point of view does the sine wave add power or does it slow the body down and leave you more vulnerable to a counter attack?xx