The Kalenjin tribe is a group of people that live in Kenya, East Africa and are noted for their outstanding athleticism and long-distance running prowess. The Kalenjin people’s higher proportion of slow-twitch muscle fibres and higher-than-average lung capacity and haemoglobin, as well as their culture of physical activity and endurance, contribute to their running skill. Moreover, their training methods, including high-altitude training and long-distance running, play a significant role in their performance.