This toolkit is one of a series of resources to help countries implement GAPPA (3). It is based on the best available evidence and practice and describes how the school environment can be used to develop, implement and evaluate strategies that promote physical activity and reduce sedentary behaviour among children and young people. The toolkit describes the importance of integrating physical activity into primary and secondary schools so that all children and young people can be physically active on a regular basis. It also outlines how to do it effectively and sustainably across national and subnational education systems. Country case studies and practical tools are provided from around the world.