It's always interesting to see East Africans doing so well. Even with technology like advances in shoes and diet/training, genetics is still a huge factor.

Also it must be an crazy feeling to be Kejelcha, the guy who came in 2nd place. It would have been a world record, except for Sawe!

Is it actually allowed to suggest that some races are better than others in some areas?

Not necessarily genetic. They run a lot, at altitude, from childhood

i feel like over a time, it becomes encoded

It was his first marathon, so he is probably thinking next time he will be the one to break the record.