Here's a confidence-killer that many of us our guilty of: slouching. One study found that the simple act of sitting up straight may encourage confidence in your thoughts and abilities. And if that's not incentive enough to switch up your stance, consider the fact that good posture can also increase energy and productivity levels. So go ahead: Puff out your chest, throw your shoulders back and stand tall. Your head will eventually catch up with your self-assured stance.

Music has a way of setting the mood -- and it can amp up your confidence, too. Some research suggests that listening to high-power music (think: 50 Cent's "In Da Club") may empower you before meetings and big events. Plus, it's easier to strut to music than silence right?