Yes indeed. Q. the Kenyans and Ethiopians for example are superb long-distance and marathon runners. I believe they have genetically adapted to run across the savannah when hunting. They're usually very tall with long legs. I'm always surprised at how easily my hubby loses heat. His hands and feet are freezing cold because his limbs are slightly etiolated, in order to cope with the 40 degree heat and high humidity of his native environment. I, on the other hand, have a nice layer of fat and am dumpling-shaped to conserve heat in our northern climate. My husband cannot seem to digest dairy products or bread easily. He's from a rain-forest hunting tribe (the Senoufou) and of course they wouldn't have kept dairy animals of any kind, or farmed grain, so his digestive system doesn't 'recognise' these foods. And just look at African hair and melanin pigmentation of the skin - it's excellent for protection against the fierce sun. None of this is in the least racist, just genetically interesting.