One of the main avenues that schools can use to positively affect health is also one most directly in line with every school’s mission: educating students. Nutrition and physical activity lessons can be woven into the curriculum—in core classroom subjects, physical education, and after-school programs—to teach skills that help students choose and maintain healthy lifestyles. In addition to teaching evidence-based nutrition and activity messages, school physical education should focus on getting students engaged in high-quality and regular activity.