Different group. They are basically Aztecs who escaped Spanish rulership in Mexico by fleeing to higher regions. They used long distance walking and running as way of travel, and that morphed into them being super human distance runner. Also, since they lived in a higher altitude, they developed more red blood cells in order to take in enough oxygen to breathe... more red blood cells, the more oxygen one will have....this is why cheating endurance athletes blood dope or take in EPO.