I’m sure some Africans have broken it hunting. As we should all know they have evolved for 1000's of years as a race of runners. Hunting on foot the best runner survives to pass on his genes. So what’s to say a genetic freak like Bekele never came along, was in good shape and happened to bust 4 on a hunt. Or may be they got in arguments on who’s the better runner and ended up racing a random distance from point A to B that happened to be a mile or longer and busted 4. You can run pretty fast in bare feet with the right kind of soil. Of course there’s no way to tell of such things happening but I believe it most likely happened and not just once.