Inactivity among schoolchildren is a challenge to public health and for the municipality in particular. This study´s aim is to evaluate the cognitive and physical as well as social and fitness adaptations, and learning outcomes of short- and long term ball training for 9-11 years old girls and boys, and to determine to what extend the organisation (5x12 minutes og 3x40 minute a week) and type of training (ball games, circuit training or running) influence the magnitude of response.