This, aimed at everyone over 30, concentrates on physical fitness as a source of permanent benefits and satisfaction. With discussion of diet, exercise, nutrition, blood pressure, obesity, etc., as a starter, he goes into programs of activities that can be selected, tailored and modified to individual needs so that for those who want to work on work-outs there are plenty of choices. He indicates how tight nerves and tight muscles can be re-educated, how systems can be regenerated before they disintegrate, how weight can be lost, and how to get in shape when one is out of shape. He warns that his practical suggestions are valueless unless followed with enjoyment and he has tips and guidance on how to be sure of that. A specialist in this field and a doctor at Harvard Medical School, the author includes case histories -- of failures as well as successes -- to prove his hard hitting point. For eager beavers.