Machines to restart a heart in cardiac arrest are often required by law in fitness clubs, but a new study found that people's hearts more commonly stop in places that are home to alternative forms of exercise.

Researchers found the employees of indoor tennis facilities, ice arenas and bowling alleys in and around Seattle were more likely to have to respond to someone in cardiac arrest, compared to those at health clubs and fitness centers. Read more: http://fxn.ws/173viIf.