Promotion of an active lifestyle in working young adults: developing and testing a smartphone-based intervention.

This study aims to investigate factors influencing physical activity and sedentary behavior in working young adults (18-25 yrs) in order to develop an intervention to increase physical activity and decrease sedentary behavior in this target group. An exploratory study will be conducted to increase knowledge. Next, a more representative cross-sectional survey and a smartphone-based intervention study will be conducted.