Longevity & AgingHow Much Exercise Actually Protects Your Heart? The Evidence Reviewed
This 2025 narrative review in Circulation Research synthesizes decades of epidemiologic and clinical evidence on how physical activity (PA) protects the cardiovascular system. It covers measurement methods from occupational observation to wearable accelerometers, dose-response relationships between PA and CVD risk, the roles of aerobic versus resistance training, sedentary time hazards, and persistent disparities in PA across race, sex, age, and socioeconomic status. Meeting guideline-recommended PA levels is associated with a 22% reduction in mortality, with the greatest gains accruing to those who start from the lowest baseline. The review highlights that overall PA volume matters most, higher intensity confers added benefit, and the 'weekend warrior' pattern appears as protective as evenly distributed exercise—provided total weekly volume is met.
