Everyone confesses in the abstract that exertion which brings out all the powers of body and mind is the best thing for us all; but practically most people do all they can to get rid of it, and as a general rule nobody does much more than circumstances drive them to do.
Bio: Edward M. "Ned" Hallowell is a child and adult psychiatrist who specialises in ADD and ADHD. He is the co-author of the books Driven to Distraction and Delivered From Distraction.