The 10-volume "Health Facts" series is intended to supplement health education curricula and to provide a handy reference for individuals who would like additional background information on particular health topics. The emphasis is placed on topics and examples relevant to youth of middle and high school age. The five sections in this book provide teachers with the basic facts about: exercise and exercise programs; the health and physiological benefits of exercise; the prevalent measures of physical fitness; activities that promote physical endurance, flexibility, and strength; and the relationship between fitness and nutrition. An easy to read reference format offers clear, concise data intended to familiarize educators with the most important facts about the issues and concerns. A glossary, a list of resources, and 38 references complete the volume. (LL)