Discussion
According to the results of this study, the studied groups, including the groups that received gain messages, loss messages, and control groups, did not have any difference in physical activity behavior before intervention. Also, immediately after educational intervention, there was no difference in the physical activity behavior of the groups, but two months after the educational intervention, a significant difference was observed between the three groups. Physical activity behavior in the intervention groups increased significantly after receiving the messages compared to before it, and it shows that education based on message framing using mobile phones (What Sapp) improved physical activity behavior. Alshahrani et al. [