title: Study finds U.S. should step it up.
mesh_terms: D000328:Adult; D003431:Cross-Cultural Comparison; D006331:Heart Diseases / Q000209:etiology / Q000517:prevention & control*; D006801:Humans; D012307:Risk Factors; D057185:Sedentary Behavior; D014481:United States; D016138:Walking / Q000592:standards / Q000706:statistics & numerical data*