Ectomorph:
The ectomorph body type is characterised by slender stature, gracile bone structure, light build, and small muscles. Shoulders tend to be thin, chest flat, body fat low. They don't easily gain weight or muscle. Some definitions require long limbs as well, others don't. This page includes short-limbed, but slender and gracile types, otherwise many East Asians would remain undefined. Ectomorphy is strongly correlated with Rohrer's index. The most extreme and very long-limbed ectomorphs are Nilotes with a Rohrer around 0.95. Ectomorphy is widespread in dry tropical climate, thus most African Steppe tribes and most desert groups like Tuareg, Arabs, and Khoisan show slender bodies. In Europe it is found in several Nordic and Mediterranean groups, in Asia throughout India and parts of China and Indonesia. Common in Australian Aborigines, more rare in America, where it occurs in the Sonora desert and the Cuyo.