Humans are fucking masochists. They're given nutritious and satisfying food just growing out of the ground, and they take it and squeeze everything good out of them, throw it out, add a ton of sugar and fat, and then try to restrain themselves from eating it. They're given a giant Earth to walk about, and a body which only requires walking regularly to stay healthy, and so they make things to walk for them and torture themselves by exercising extra just to stay fit. Wtf, amirite?