Episode 3: What happens when you are not there? Lessons from a large trial delivered in schools.

In this episode Dr Emma Davies speaks to Dr Catherine Wheatley about her experiences of working on a large trial to test an intervention that aimed to increased physical activity in adolescents. Catherine explains the aims of the trial and talks about some of the measures, as well as what was learned from some of the challenges that the study team faced. Important issues such as fidelity, engagement and co-production, which are relevant to all intervention topics, are discussed.