A form of diabetes has been linked to a gene most commonly found among North American Indians. In fact, highly heritable characteristics such as skeletal structure, the distribution of muscle fiber types, reflex capabilities, lung capacity, and the ability to use energy more efficiently are not even distributed across racial groups and cannot be explained by known environment factors. Popular thinking lags the genetic revolution. Consider diving, gymnastics, and ice-skating, sports in which East Asians excel. Asians tend to be small with relatively short extremities, long torsos, and a thicker layer of fat.
Eurasian whites are the premier wrestlers and weight lifters in the world.
Evolutionary forces have shaped a population with large, muscular upper bodies with relatively short arms and legs and thick torsos. These proportions tend to be an advantage in sports in which strength rather than speed is at a premium. Athletes who trace their ancestry to western African coastal states, from where British, Caribbean and American blacks trace their primary ancestry, are the quickest and best natural leapers in the world. They almost completely monopolize the sprints up to 400 meters. No white or Asian runners have broken 10 seconds in the 100 meters.