Background
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Physical inactivity is a global pandemic and a leading cause of physical and mental health issues [Lifestyle interventions targeting children’s health behaviours, including PA, have often included parents as an important focus of change, as parents play a critical role in the health behaviours of their children [It is highly recommended, when developing and evaluating an effective lifestyle intervention, that a theoretical framework is used, as clear theoretical underpinnings are known to maximize the potential for intervention effectiveness [The primary goal of the present study was to evaluate the efficacy of a newly developed lifestyle intervention for fathers and their children (i.e. ‘Run Daddy Run’ intervention) [