Step it up family: Efficacy of an activity tracker-and app intervention to increase physical activity in the entire family

Background: Interventions using activity trackers and smartphone apps have demonstrated their ability to increase physical activity in children and adults. However, they have not been tested in entire families. Further, few family centred interventions have actively involved both parents, and assessed intervention efficacy separately for children, mothers and fathers. Purpose: This study examined the short-term efficacy of an activity tracker and app intervention to increase physical activity in the entire family (children, mothers and fathers).