Promoting Health-Enhancing Physical Activity: a State-of-the-art Review of Peer-Delivered Interventions.

Peer-delivered interventions appear to represent an efficacious, although under-utilized, means of promoting health-enhancing physical activity, among diverse populations across the lifespan, and in different settings. Nevertheless, research has largely failed to identify the salient behaviors/strategies of peer leaders that can promote behavior change among target populations, as well as explanatory mechanisms (i.e., mediators) of intervention effects. Balanced against recent evidence for the efficacy of peer-delivered interventions to promote physical activity, work in this area appears impeded by an absence of peer-centric explanatory frameworks and theory that may optimize both intervention delivery and efficacy/effectiveness.