y va marquer wrote:
A sedantry lifestyle is far more unnatural to us
No doubt. And we are made to run occasionally.
But we are first and foremost made to walk. There was a period in our evolutionary history when running came very handy, but there have also been large periods before and after when it hasn't.
Christopher McDougall is a journalist, not a biologist. He has a licence to exaggerate that scientists cannot afford.
Those of us of white ancestry probably faced very strong selection to adapt to an agricultural lifestyle that involved no running whatsoever.
Personally I grew up running barefoot and I can fare pretty well even in hard surfaces. But whether an obscure Mexican tribe can afford to run for several km or not doesn't necessarily mean that your typical welsh person is equally adapted to that same exercise regime.