It's the biology, stupid. The human body is a perfect barefoot running machine, originally designed for persistence hunting to get the necessary food so that our species could survive, and nowadays for doing marathons to stay healthy and happy. This means two crucial things for current humans. First, those who don't regularly run long distances are likely to suffer from the chronic diseases stress, depression, insomnia, fatigue, obesity, stroke, diabetes, high blood pressure, erectile dysfunction, kidney failure, loss of mobility or cognitive abilities, some cancers, etc. against which doctors and drugs are proving increasingly helpless, hence the seemingly unstoppable exponential expansion of the epidemic throughout the world. And second, since shoes act like a bug in the system, those who run marathons wearing sneakers are highly likely to sustain diverse pains and injuries. The first barefoot runner of a marathon broke the world record in 1960. Sadly, he afterwards decided, for what