Asians are naturally fast-twitch but have absolutely no sports culture to speak of to develop these abilities. Look at how many of our boys in the US, Canada and Europe have done the 100 and how many sub-100s have we produced? 1.
How many are seriously running in Japan and China and India and look how currently Japan is the fastest nation on earth when it comes to low 100s. Also Japanese athletes don't use drugs. They see it as a moral failing and against the budo precepts.