Asking for at the moment impossible proof while asserting something even more unlikely is willful ignorance. You are in fact saying that success in sports is 100% cultural?
But here’s more evidence you are incorrect in asserting that it’s 100% cultural. Why Kenyans Make Such Great Runners: A Story of Genes and Cultures - The Atlantic
Here’s a short excerpt from that article.
With a few months training young men beat the best Western professional runners. Who have access to the best sports science, money, and food in the world. Seems likely that bus riding Kenyan’s just happen to have the ‘culture’ that disproportionately represents them in a long distance running compared to every other ethnicity or tribe in the world. Hell, it seems like the cheapest method for western runners to compete in long distance running is to take a multi-year teen sabbatical to Kenya. Screw training.
But since we don’t have definitive proof that at least some success in sport which is dependent on body can be attributed to genes it therefore must follow that it’s more likely that it’s 100% cultural? That’s purely ideology clouding reason.