RecruitingBehavioural interventionCo-Creating Active Middle School Communities to Increase Student Physical ActivityThe purpose of this study is to identify community-level barriers and facilitators for active transport and leisure physical activity and to co-create and test the effectiveness and longer-term sustainability of community-based physical activity intervention strategies in middle schools. Participation in this study may help the investigators and scientific community better understand and address child physical activity and health. This study will collect information about middle school children's physical activity behaviors, habits, knowledge, and activity. The UTHealth School of Public Health is leading the study together with the University of Texas at Austin.