The chances of surviving sudden cardiac arrest are higher at the gym than any other indoor setting, likely due to easier access to AEDs and user manuals.

Surviving sudden cardiac arrest depends largely on the people around you and easy access to an automated defibrillator, or AED. It turns out that the gym is the best indoor location for cardiac arrest victims’ survival chances, likely because of the increased presence of AEDs and well-placed instruction manuals.
An American College of Cardiology study looked at 3 indoor settings: gyms, alternative athletic sites (like dance studios or bowling alleys) and nonathletic sites (like banks and shopping centers).