#6 WORKING OUT TOO HARD.
We all know exercise is good for the heart, but couch potatoes who suddenly jump into vigorous workouts are upping their risk for a heart attack. Doing too much too soon is dangerous, so talk to your doctor before starting any exercise routine. And remember, just because you look healthy on the outside doesn’t mean you’re healthy on the inside: Hypertension and other heart-related conditions often have no symptoms. Marathoners aren’t off the hook, either. Extreme athletes may push their bodies too hard, bringing on heart problems that otherwise wouldn’t occur, says Rafii. This doesn’t mean you have to hang up your sneakers. Just talk to your doctor before signing up for your next race.