An old adage tells us that everything in moderation is healthy, but what about exercise? Unfortunately there is such a thing as too much exercise and there are real victims of this addiction. It can cause extreme weight loss, overuse injuries, exhaustion, depression, and heart problems, among other serious problems. This volume provides young readers and researchers a means of understanding exercise addiction and its ramifications. Readers will learn what causes it, how people live with it, and the latest information about treatment and prevention.