Walk into any gym, and you'll find people pumping iron and pressing the play buttons on their electronic gadgets. However, what exactly are they listening to, and why? We asked some members at Gold's Gym on Bragg Boulevard and Cape Fear Valley, N.C.'s HealthPlex Center to share their music preferences with us. We discovered their playlists are as different as their exercise regimens.

Playlist Power: Shaping a Workout With iPods and iTunes