>>10831973Unironically memes.
The nations that are good at sprinting are the ones that take it more seriously on a community level. All the kids want to be runners, the most popular kids are the most athletic.
And thus, the runner who has the best genes is more popular with women and is better able to pass on their good running genes.
That's why east Africans who hunted by chasing down animals for long periods are the best long distance runners.