Making calisthenics interesting is a continuing chore for classroom teachers in the early grades as well as for physical education specialists. This book, part of Sterling's Athletic Institute Series, seems best used by teachers for their recreation plans, although the vocabulary allows for pupil use too. The muscle-building games described involve squatting, balancing, posture aids; in short, they attempt to bring all the muscles into play. The authors have several juvenile game books to their credit. Illustrations by Doug Anderson provide visual aids to positioning boys and girls for these otivated exercises.