You finally got your heart rate monitor and now it’s on! It almost becomes an obsession. How many calories did I burn? What was my fat burning percentage? Gotta keep my heart rate high. And nothing is worse that getting through tough work out and then checking your heart rate monitor app only to see you only burned half the calories you were expecting. Almost makes you want to throw that heart rate monitor in your junk drawer, otherwise known as the graveyard of forgotten gadgets. But wait! There may be more to that heart rate monitor than you know.