Perkin, Posie and Pootle Flump are riding the Flumpcycle. Pootle says he could ride it all the way to the Moon. When they ask Pa how far the Moon is he tells them they would need a rocket - so they build one of cardboard tubes.

Pootle and Posie are standing on their heads, Perkin comes along and shows them how to do proper exercises. All of The Flumps have ways of keeping fit - but Grandfather Flump soon wishes he hadn't tried to lift Pa's weights.