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After-school programs are considered to have great potential to provide opportunities for increasing physical activity. One factor that may influence the success of a physical activity intervention is program implementation. The purpose of this study is to understand factors that influence implementation of a 30 minutes structured physical activity session in an after-school program. After-school staff (organizational leaders, site program managers and fourth grade group leaders), from four after-school sites attended three trainings over the academic year and were given the goal to implement 30 minutes of daily structured after-school physical activity to fourth grade children following CATCH guidelines. At the end of the year two organizational leaders (mean age = 55.0), four program managers (mean age = 27.3), and 13 group leaders (mean age = 21.3) were interviewed (N = 19) and completed a survey. Interviews were recorded, transcribed and analyzed using QSR NVivo software. Several factors influencing implementation were revealed. First, progra