When George sees a cricket at the annual country gymnastics competition he decides to follow it across the gymnastics obstacles because, being a monkey, he is very good at jumping and swinging. When Mrs. Somersault the area gym teacher sees George, she decides to sign George and Allie up for her gym class, which Bill also agrees to join. While they all enjoy her gym class, they are disappointed to find out that it only takes place once a week. So, they decide to build a gym of their own in the back yard of the country house, where they can practice when it is not gym class day.