2.2. Participants
The target population were students across all subjects at Philadelphia University in Jordan with no medical illness that prevented them from undertaking moderate physical activity, for example brisk walking. Sample size calculations was based on statistical power and the difference in mean change of PA level (steps per week) between control and intervention group. The calculation was made to detect improvements in PA level of 10,000 steps per day which was considered as a moderate difference between the control and intervention group. Two-sided 5% significance level and power of 80% was estimated. The total sample size of 156 participants was required accounting for up to 15% loss to follow-up.