I came into this thread wayyyyy too late, and didn't really feel like filtering out all the troll posts, but what I do have to add is that I ran cross country and track in high school and there was definitely an aspect that I saw that definitely was genetic. I trained extremely hard throughout my high school track and XC seasons, and never quit in the off season, but there was certainly a limit and only so high I could peak, along with others. I ran in San Diego and had ridiculously competitive runners in D1. If anyone has heard of Darren Fahy, he was one of the best runners in the nation for high school, I ran against him when he ran a 4:08 1600m and an 8:54 3200m. And was there when he placed 14th at nike nationals in san diego. Very impressive, but when I ran against him, we talked a lot and discussed differences in workouts, and it really wasn't much different. It wasn't that I trained harder and burned out, but I do feel it's genetic. People on my team trained just as hard as I did, but weren't as good. Fahy's parents were also phenomenal runners, so I imagine that helped. So as far as different races as a whole having more talent than others in distance running, I don't think it's at all impossible to say that there is truth in that. Some people think that it's bad or not appropriate to think that one race could be superior in some way but I don't see the problem in recognizing that, especially when I consider my experience in high school. I can't imagine a lot of other people don't think that either from having sports experience. Especially with something like running where it's entirely physical with no talent needed, like ball sports etc. (not saying those sports don't require physical ability, they require both)