ReZoom

The Apple iPod has become almost as ubiquitous at health clubs as sticky Nautilus machines and creepy guys who can't stop looking at themselves in the oversized mirrors.

Further strengthening its already towering brand, Apple has teamed up with Nike to make your workout soundtrack not just inspiring, but useful. The Apple + Nike is a two-piece device that connects your iPod Nano to your running shoes. The first piece is a wireless sensor that slips into a special pocket inside Nike's new Nike+ running shoe. The sensor transmits information to the second piece, a receiver attached to a Nano, which tracks distance and burned calories, and alerts you when you've met predetermined goals. As you work out, a friendly voice updates you with distances and other workout-related info.

After you've finished, plug the iPod into a computer to sync with iTunes, and it sends your workout information to an online database where you can track your progress. There's even a feature called "powersong," in which you can choose a song that gives you motivation for those moments when you want to quit, go home and eat cheesecake. The Apple + Nike sport kit retails for $29.99.

As with all things iPod, there are extras to buy and alternatives to consider – the most important being shoes. Nike offers a couple options on shoes: the AirZoom, which runs about $100 and can be color-coordinated to your Nano and AirEqualon, which runs about $130. Alternatively, upstart companies have already formed to outfit your fave Asics or New Balance shoes to accommodate the Apple + Nike sensor.