I found this article while researching the importance of health clubs having an AED(Automated External Defibrillator).  Essentially, the risk of a heart attack is higher during exercise, and gyms should be prepared for such an event.  Unfortunately, only 3% actually are prepared to revive you in the chance that you have a heart attack.

So, if you have a history of heart problems, are elderly, or are interested in taking every precaution to protect yourself, you should ask your gym owner if they have an AED.  If they do, it should be obvious with a sign over it.  If they don’t, then you may want to take your business elsewhere.

When Exercise Turns Deadly