The Tarahumara Natives
“The Tarahumara Natives of southwestern Chihuahua are the ones who can run a hundered miles – their blood pressure doesn’t go up and their heartbeat doesn’t change. Some entrepreneur took some hundred-mile runers to the Olympics (1928, Amsterdam). They didn’t even place. Because, they thought twenty-five miles was when you warmed up! It hadn’t been explained to them that their run was twenty-five miles long.”
(Milton H. Erickson)