It takes a lot to be an Olympian. Hard work. Determination. And a killer iPod playlist. While our steady rotation of Beyoncé and Britney may suffice to get us through our 20 minutes on the elliptical, we asked the real athletes—the members of Team U.S.A. going for gold in Sochi—what they listen to when training to get ready for competition. Here’s what they had to say.