Physical inactivity is a growing public health concern. Use of mobile applications (apps) may be a
powerful tool to encourage physical activity and a healthy lifestyle. For instance, apps may be used in the
preparation of a running event. However, there is little evidence for the relationship between app use and change
in physical activity and health in recreational runners. The aim of this study was to determine the relationship
between the use of apps and changes in physical activity, health and lifestyle behaviour, and self-image of short
and long distance runners.