Interpersonal Level
Peer groups were organized to operationalize collective efficacy, observational learning, and incentive motivation. Each peer group was formed based on the wishes of the participants, with 3 to 10 members, and was constructed to facilitate the motivation and engagement of participants. Each group leader was elected by all members in the group. The group leaders were responsible for organizing and facilitating the exercise. The peer group was also reminded to engage in group exercises through telephone calls once a week. Rewards (living goods not related to physical activity) were given to group members who achieved their group exercise goals and to the responsible group leaders who actively supervised the group exercise.