The study of motivation goes back to the Greeks. Their sports were essential to their education. They saw in sports the integration of body, mind and soul, the creation of beauty, the mastering of athletics, and the challenge of competition. A French sociologist points this out. "Sports," he wrote, was part of the education of the citizen. He was expected to engage in exercise for a whole series of reasons that had to do with the shaping of the citizen; the relation between moral good and physical good; and the growth of a person.
Exercise: you don't have time not to