When you're at the gym working out, you probably don't want to hear the
huffing and puffing of the sweaty guy (or gal) next to you. That's part
of the reason why you might bring along your iPod or iPhone along with
you, bobbing your head to the latest Smashing Pumpkins release or
pumping your fist to the adrenaline-fueled tunes of Journey. Whatever
your musical interests, you want to keep your mind focused on the music
and not the grunts of the other gym rats.