This document summarizes the Coordinated Approach To Child Health (CATCH) program, which aims to prevent childhood obesity through environmental and behavioral changes in schools. CATCH targets physical education, classroom health education, cafeteria nutrition, and family involvement. Studies show CATCH is effective at increasing physical activity and healthy eating, and has reduced obesity rates. CATCH has now been implemented in over 2,000 Texas schools and other states, demonstrating the potential for effective programs to have public health impact at scale.