“…A physically inactive lifestyle is a serious risk factor for health problems. The World Health Organization (WHO) has reported that engaging in regular physical activity (PA) reduces the risk of health disease (e.g., diabetes), physical (e.g., obesity) and psychological (e.g., low self-stem) problems [29,52]. Effecting behavioral changes in people to become more physically active has been the target of technological interventions, such as integrating sensing devices for PA tracking (e.g., [17,50]), thus allowing self-monitoring and goals setting (e.g., [7,11,12,26]), but technological support provides very limited psychological support.…”