Are you completely sure there isn't some culture reason they are so good at running? There are so many variables at play beyond our modern understanding. It's

Are you completely sure there isn't some culture reason they are so good at running? There are so many variables at play beyond our modern understanding. It's just a topic we really don't have a good grasp of, as is the case with most of medicine. We understand a lot of strategies, but our understandings of root causes is still very poor.