Your heart is one of the hardest working parts of your body. It’s also one of the most threatened. In fact, according to the Centers for Disease Control and Prevention (CDC), heart disease is the leading cause of death for both men and women in the U.S. – about one in four deaths. Additionally, in the U.S., someone has a heart attack every 40 seconds. And about one in five of those heart attacks is silent – meaning you may not be aware of damage to your heart that is happening or has already taken place.