The Sun Bushmen of the Kalahari desert are some of the finest endurance runners in human history, consistently outpacing western runners while wearing just loincloths and sandals. Their running ability is so advanced and refined that they use it as a weapon for survival through a practice called ‘persistence hunting’. It works like this: The San chase a gazelle on foot, running after the much faster animal at a steady pace. Over time the gazelle will slowly tire and overheat, while the cooling s