The purpose of this study was to explore 1) perceptions of preschool-8th grade teachers' in regard to classroom physical activity (PA) and 2) multiple levels of factors impacting preschool-8th grade teachers' ability to implement PA into the classroom. Sixty preschool-8th grade teachers from five school districts participated in semi-structured interviews following a guide developed from constructs of the social ecological model. All teachers implemented classroom PA but had varied levels of confidence for implementation. Teachers identified barriers to implementation and requested additional classroom PA resources. Furthermore, they identified collaboration with other teachers as an underutilized resource for promotion of classroom PA.