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Aren't they more likely to be unknown and unmeasured physiological responses because while humans /mammalian responses to physical stress and training are old, knowledge of them is not?
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Isn't it less genetic mutation and more the fact that the existing humans are more readily identified as being good at certain sports and with globalisation, shared knowledge, talent spotting, etc. these people can much more rapidly find a sport that makes the most of their genetic gifts?
Chalfie
hippy
@Jimmy_Fingers
Ok hyperbolic to call it evolution but the fact remains nature is unpredictable and genetic outliers are both highly probable and happening really. Admittedly I did study this at degree level twenty years ago but that was the fundamental when I did: accidental mutation that is reproductively advantageneous. In other words, shit happens