Three runners collapsed and died during the Detroit Marathon on Sunday. Although that news is shocking and frightening for runners and non-runners alike, such deaths are rare, experts say.
"Among young people, high school and college athletes, there's one death in about every 200,000 people [during exercise in general]," says Dr. Paul Thompson, the director of cardiology at Hartford Hospital, in Connecticut.
Despite three deaths in Detroit race, runner fatalities are rare - CNN.com