In sprint racing, for instance, runners of West African origin dominate. In distance running East and North Africans are ahead of the pack. In field events relying on upper body strength, Northern Europeans appear strongest. With advances in the human genome project more light may be shed on these trends. Anyone who thinks that we will find a gene for sprinting or a gene for throwing, however, is probably barking up the wrong tree.
Biology is never that simple and it takes a whole complex of characters to make a champion.