Help Us Make a Playlist — What Are Your Favorite Workout Songs? [SURVEY]

We were talking about exercise playlists this morning. We got our web guy Andrew to show us his iPod. Now it's time to open up yours. Help us make the ultimate playlist:
This is totally anonymous, so be honest. Everyone's got songs they're embarrassed to reveal (that's a survey for another day). We want to know what your very favorites are. We'll share all the results next week and create the ultimate exercise playlist!