This document summarizes a study that examined the effects of a 5-week cross-curricular physical education intervention on reception children's (ages 4-5) fundamental movement skills, physical activity, and weight status. The intervention incorporated lessons based on the story of "The Gruffalo" and assessed changes in these variables before and after for an intervention school compared to a control school. Key findings were that the intervention significantly improved children's fundamental movement skills and weekday physical activity, but did not significantly impact weight status or weekend physical activity. The intervention provides a model for using cross-curricular lessons to improve movement skills and physical activity in young children.