Why do niggers have good bodies?

I always wondered by niggers have such muscular bodies, even when they seem to be doing nothing at all. nothing at all. NOTHING AT ALL. NOTHING AT AAALLLL.

is it something in the genes? Also why do they have big cocks.

So in other words, black people are good at short bursts of power while whites are more endurance? I'd like to see the study for it, I'd doubt the difference was significant.