Across nearly half a million lives tracked over more than a decade, researchers have found that one of humanity's oldest physical acts — climbing stairs — is quietly associated with a 39 percent lower risk of dying from heart disease and a 24 percent lower risk of dying from any cause. Published in the American Journal of Cardiovascular Drugs, the analysis of nine studies reminds us that meaningful health interventions need not be elaborate or expensive. In a world that has engineered effort out of daily life, the simple choice to take the stairs may be among the most democratic acts of self-c