re: Race-Geography-Football

So what do y’all believe is the reason blacks are so much more physically superior? Obviously physiological, but is it the result of ‘breeding’ during the slavery years or did it start before that with survival of the fittest in the African jungles? I believe it developed in African jungles refining the abilities that allowed some to prosper by running fast and being stronger than anything required by the Caucasian races for survival.