Evolution by climate and predation.
Northern – hardier. Southern – faster.
Anyone who’s lived a day in his life (or played summer football in a city park or worked out at a vibrant gym) has noticed that different races have different musculature and athletic talent. Blacks are the most ripped, and often the biggest, particularly in the deltoids and lats. They respond the fastest to resistance training and are amazingly agile on their feet, (something you have to marvel at the first time a black guy with the ball makes a cut around you).
Whites are the most varied, ranging from nerd skinny to hulking well-marbled powerlifter. Few whites can get as defined as blacks, so you really become aware of those white guys who do manage to carve their abs and delts well past the norm for their race. Whites also have wider waists than blacks, and tend to stockiness, although this is far from a universal white trait.
Asians…
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