Authored by the American College of Sports Medicine, an international body of physicians, scientists, athletic trainers and allied professionals. Includes activities and multi-level sample programs for every age and fitness level, ranging from children and adolescents, through older adults. Contains strategies for planning and tracking progress. Provides tools for determining body composition, cardiorespiratory and muscular fitness, and flexibility. Offers step-by-step instruction with full-color photos for increasing muscular strength and flexibility/balance, along with guidance for choosing the right cardio training option based on one's time and interest.