Background
Physical inactivity is one of the most significant contributing factors of ill-health [Relative to leisure-time physical activity, there has been limited investigation of interventions to increase transport-related physical activity [The potential contribution of public transport use (such as train/rail, ferry, and bus) towards transport-related physical activity and physical activity is largely realised through additional incidental walking (and potentially cycling in certain contexts) associated with access/egress. In general, people are willing to walk 5–10 min to a stop/station, although this is subject to a range of factors pertaining to the type of service, trip purpose etc. [One promising method of intervention is the incentivisation of physical activity through financial reward. Previously, financial incentive-based intervention has been successfully applied to alter health behaviours [It was hypothesised that intervention group participants would increase steps taken each day and levels of self-reported transport-related physical activity (thus increasing total physical activity), compared to control group participants.