Measurement
BLIND
The primary outcome measure for this study is physical activity, which was assessed using the Exercise Recreation and Sport Survey (ERASS) [To develop a profile of those who did (or did not) reach/maintain these two MVPA thresholds, we drew on single-item measures of social and cognitive determinants of physical activity aligned with the Theory of Planned Behavior framework [To assess the influence of health-related factors on physical activity, we drew on the single item global self-rated mental health measure [The trial measures were administered at each data collection timepoint by a trained team via computer assisted telephone interviews. The interviews took approximately 20 minutes and the interviewers were blind to participant group allocation.