Discussion of exercise, which with sleep and proper food make up the essentials of keeping fit. The physiology of exercise, muscles, nerves, circulation, digestion, etc. Effect on each of exercise -- or its lack. Then the psychological benefits, when to exercise and how much, choice of recreation. Last half deals with games, their history, technique, and benefits. Repetitious, homespun, fairly obvious, but another adequate book for the self-help shelf.