The Fitness column last Thursday, about nutritional supplements for exercisers, overstated Dr. Teri M. McCambridge’s role at the American Academy of Pediatrics. She is the chairwoman of its council on sports medicine and fitness, not the chairwoman of the entire academy. The article also referred incorrectly to nitric oxide; although caffeine is often added to supplements that contain it, it is not a caffeine-based stimulant. And a picture caption with the article misidentified the exerciser who begins his morning workout by taking .-Xplode. As the article correctly reported, he is Michael Deutsch not Alex Feintuch, who is shown in the picture.