Intervention includes exposure to physical activity and healthy eating intervention policy implementation, staff training, a challenge/self-monitoring program for healthy behaviors, a peer-coaching program for healthy behaviors, and a social marketing campaign.

Using a community-based participatory approach, BGC staff and academic researchers developed intervention components informed by formative studies and based on a social ecological theory framework. Components included healthy eating and physical activity policy implementation, staff training, a challenge/self-monitoring program for healthy behaviors, a peer-coaching program for healthy behaviors, and a social marketing campaign.

Self-efficacy was assessed with a survey adapted from instruments developed for the Patient-centered Assessment and Counseling for Exercise plus Nutrition program for low-income, ethnically diverse adolescents. It was scored on a 10-point Likert scale from 1 (not at all confident) to 10 (extremely confident).

Motivation for physical activity was scored on a 10-point Likert scale from 1 (not at all motivated) to 10 (extremely motivated).

For body mass index (BMI), weight was measured to the nearest 0.1 kg using a single scale. Height was measured to the nearest 0.1 cm using a stadiometer. BMI was calculated as weight (kg)/height squared (m2).