Origins of physical activity epidemiology -- Concepts and methods in physical activity epidemiology -- Measurement and surveillance of physical activity and fitness -- All-cause and coronary heart mortality -- Cerebrovascular disease and stroke -- Physical activity and hypertension -- Physical activity and hyperlipidemia -- Physical activity and obesity -- Physical activity and diabetes -- Physical activity and osteoporosis -- Physical activity and cancer -- Physical activity and the immune system -- Physical activity and mental health -- Physical activity and disability -- Hazards of physical activity -- Adopting and maintaining a physically active lifestyle