Hear an assortment of muscle-pumping, pain-annihilating anthems — as compiled by athletes, celebrities, NPR personalities and, of course,... Everybody has that one song that pushes you into a sprint ...

I'm always looking for new YouTube workouts (why yes, I do have three separate personal playlists of my faves), so when I saw Bretman Rock's ab workout video had racked up more than a million views, I ...