Original sentence: Some schools teach the "sine wave" technique when performing patterns
Edited sentence: Choi Hong Hi's books state that Power = ½mv², although that equation refers to kinetic energy, not power.In fact, to most Asians, this word merely means breath or air.In the United Kingdomin the 2000s, Adidas taekwondo shoes became a surprise fashion item for young people and were worn outdoors in all weathers.Some martial arts attribute such skills to application of the mythical life force called Qi/Chi (Chinese) or Ki (Korean and Japanese) (氣/기).Some schools teach the scientifically dubious "sine wave" technique when performing patterns.Taekwondo attributes its breaking techniques more rationally to simple physics.The rationale for this is vaguely given as using the 'theory of power' although ITF publications confuse energy, force and power.This led to a great profusion of styles and colours of shoes