Methods
sedentary behaviors
YACS participated in a 12‐month randomized trial that compared self‐help and intervention groups. All participants received an activity tracker, smart scale, individual videochat session, and access to a condition‐specific Facebook group. Intervention participants also received lessons, tailored feedback, adaptive goal setting, text messages, and Facebook prompts for 6 months, followed by tapered contacts. Accelerometer‐measured and self‐reported PA (total [primary outcome], moderate‐to‐vigorous [MVPA], light, steps, sedentary behaviors) were collected at baseline, 6, and 12 months. Generalized estimating equation analyses evaluated group effects on outcomes from baseline to 12 months.