i think its to do with muscle structure or something. theres different types of black people though. ones like kenyans arent good sprinters but r good long distance runners. black people r usually more powerful than white people. suff like sprinting suits them more. but i think white people r stronger from a still position such as weightlifting and worlds strongest man. i think black peoples muscle structure is a lot denser meaning theyre not as good at floating in the water. im not an exper but im pretty sure this is true.