Investigating Adolescent Girls' Perceptions and Experiences of School-Based Physical Activity to Inform the Girls' Peer Activity Intervention Study.

The findings highlight the importance of choice, peer groupings, noncompetitive opportunities, and PA competence to adolescent girls' school-based PA behaviors. The school environment can support and restrict girls' engagement in PA. The findings will be applied to the design, content, and implementation of the G-PACT project.