This article presents a physical activity portfolio designed to help students manage their own fitness and health-related physical activity outside of the physical education classroom. A main goal of physical education programs is to prepare students to lead a physically active lifestyle and maintain a lifetime of health-related fitness. The challenge lies in finding ways to engage learners in managing their own learning and applying knowledge in their personal contexts outside of school. The article describes each component of the portfolio and describes how it can contribute to the goal of teaching students to take personal responsibility for their physical activity behaviors outside of school.