Fitness programs can be greatly enhanced with the addition of fitness balls. They are a fun, challenging, economical, and safe way to incorporate a cardiovascular, strength, and stretching program for all fitness levels in a physical education setting. The use of these balls has become more popular during the last decade, and their benefits and uses have also become more common. This article described four kinds of fitness balls, and offered example exercises that can easily be implemented in the classroom. Although each ball is different in size and composition, they provide fresh opportunities for fitness in the classroom and help prepare students for a long and healthy lifetime. (Contains 22 photos.)