Answer :
Epstein referred to the fact over time humans have adapted and this leads to bodies that are better adapted to sports.
Who is Epstein?
David Epstein is a reporter better known for his research about sports performance and genetics.
What is the gene pool?
This refers the genes found within a population or species and the diversity in it.
How has the gene pool push athletes forward?
According to Epstein nowadays there is a lot of genetic diversity, which lead to specific athlestes to have a body that is better adapted for sports. This trend is also the result of technology as well as envirnomental changes that promote adaptation.
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