Patricia Boal speaks with Dr. Christopher Labos, cardiologist and medical writer with a degree in epidemiology, about a recent incident involving a 15-year-old dying during a long-distance run in the Netherlands and whether or not that kind of exercise is dangerous for younger participants or in general.

<p>Patricia Boal speaks with Dr. Christopher Labos, cardiologist and medical writer with a degree in epidemiology, about a recent incident involving a 15-year-old dying during a long-distance run in the Netherlands and whether or not that kind of exercise is dangerous for younger participants or in general.</p>