Exercise? Geronimo? Not a chance! So when he accidentally gets signed up to the Mouse Island Marathon, Geronimo can't pull out fast enough. Unfortunately his family has other ideas, and they soon have a whole fitness plan set out for him. Will Geronimo make it across the finish line on the day? The series is perfect for 5 to 8 year old's both avid and reluctant readers due to its expressive typeset, fun illustrations and humorous stories.