Assessing the Acceptability of a Preschool-Based Multi-Component Physical Activity Intervention Entitled "I'm an Active Hero" (IAAH): Process Evaluation of a Feasibility Trial.

Background: Interventions within preschool settings have gained prominence due to the need to increase physical activity (PA) in early childhood. We first developed a 10-week preschool-based behaviour change intervention, guided by the UK Medical Research Council's framework for complex interventions. We then conducted a cluster feasibility randomised controlled trial (RCT) among young children.