Reviews factors that led to the issuance of official pronouncements on the health implications of physical activity by various prestigious scientific and medical societies, summarizing several statements. Emphasis has shifted from endorsing structured exercise to supporting public health interventions to promote physical activity through…

Examines current guidelines for physical fitness, noting issues that may influence the updating of the American College of Sports Medicine exercise statement. Differences between exercise prescription for fitness and physical activity for health are discussed, noting the importance of designing individualized programs with appropriate levels of…

This paper presents epidemiologic evidence on the contributions of physical inactivity and reduced cardiorespiratory fitness to risk of coronary heart disease (CHD). The types and dose of physical activity to reduce risk of CHD and plausible biologic mechanisms for the partial protective effect are reviewed. (Author/SM)

After presenting positive and negative aspects of stress, the paper looks at definitions of stress that emphasize the environment, responses to the environment, individual characteristics, or a combination of these elements. A proposed definition of stress is offered. (SM)