Nothing to do with any special muscles... they do have more quick twitch muscles but they are not different. It was the survival of the fittest they took the dumbest and strongest then those dumb and strong only the strongest survived those boat rides... then they get to america and the biggest for sure had more sex because that's how black culture works in general. Do that a couple hundred years and you end up with fatherless LeBron James 6 foot 8 260 pounds who runs and jumps like a normal size person..
With all that said a 18 year old white boy has a top 5 all time 100 yard dash...
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