Development of intervention strategies to increase physical activity and to decrease sedentary behaviour among secondary schoolgirls using participatory health research.

As secondary schoolgirls are many hours sedentary and not sufficiently physically active, the development of an intervention in this group is important. The intervention will use a participatory health research approach by actively involving the girls in the entire research process.The final aim is to provide a prototype with the most important intervention strategies to change behaviour among secondary schoolgirls.