&NA;A 36‐year‐old marathon runner with a previously normal electrocardiogram developed a bifascicular block (right bundle branch block plus left anterior hemiblock) and has continued to run without incident. Exercise testing, radionuclide scanning, and echocardiography revealed no evidence of reversible ischemic heart disease or of ventricular dysfunction. These noninvasive techniques are useful in evaluating the cardiac status of a clinically normal, endurance‐trained athlete in whom electrocardiographic changes have been demonstrated.