The purpose of this study is to determine whether cycling to school is effective in the prevention of the metabolic syndrome.

Physical activity plays a crucial role in relation to prevent a clustering of risk factors. In adults a lower all-cause mortality has been found in those cycling to work compared to inactive commuters. It thus seems possible that cycling to school will entail health beneficial effects for children.

Inclusion Criteria:

• passive commuted to school last 6 months, own a bike

Exclusion Criteria:

• less than 2 km to school