Peer coaching is proposed as a STEM strategy for after school programs. It fosters youth development by giving students ownership and autonomy over peer teaching. Peer coaches can help other students grasp difficult concepts through extra support. After school programs provide an ideal setting for peer coaching as they promote skill building, supportive relationships, and responsibility. Teens make good peer coaches as they can communicate content simply and inspire excitement. Programs should select coaches based on leadership abilities and train them on teaching skills, conflict resolution, and lesson content like UV beads and stomp rockets. Both short and long-term planning are needed to implement an effective peer coaching program.