Whites : Because the White race is so diverse it's hard to focus in on this particular Group,
All races are diverse. Have you guys ever traveled ?
West Africans and people of West African decent tend to follow the stereotypes you guys describe.
Ever seen a Kenyan sprinter or a West African Marathon runner ?
Same phenomen in Asia and Europe. Over thousands of years adaptation and natural selection has created people that are adjusted to their environment. Regions were swimming used to be important for survival happen to produce many good swimmers, highlands produce great runners and so on.
Places like the US, where most people are imigrants are obviously different - except if they all come from the same place (West Africa in the case of most African Americans)