Essentially an exercise program with a long build-up, laced with examples of 80-year-old marathon runners and the like (if they can so can you). But if this is intended for older people who want to retain strength and endurance, the exercises, including sit-ups and push-ups, seem too strenuous to tackle without a long conditioning period. Overall there are minimal guidelines for exercising (exercise in moderation; repeat an exercise two-to-five times if a beginner, five times if advanced); and the unwary might easily pull or strain an underused muscle. An exception is the leg exercises designed to be performed in a swimming pool; they are not significantly different from exercises performed on land (knees to the chest; legs stretched out to the side), but doing them in the water makes them less taxing. On the whole, though, standard fare where some special attention would seem to be called for.