Over time the lean, linear, tall, long-legged, easy-striding modern human became the greatest endurance athlete on the planet. The only mammal, who because of an unmatched ability to sweat profusely from his entire body surface, is able to run without overheating in midday heat. And so to capture and devour the energy-rich bodies of the large non-sweating African antelope, on which humans were so utterly dependent at that time.