Garmin Vivofit

It seems everyone and their mother is throwing their hat into the wrist-worn fitness tracker ring lately — and Garmin is no exception. The Garmin Vivofit ($170) is pretty typical as far as the competition is concerned, save one important feature. Its user-replaceable battery will last up to one year at a time, saving you from annoying recharges every couple of days. Meant to be worn at all times, it tracks your sleep as well as your physical activity, and has functionality that monitors how long you've been stationary, letting you know to get up and walk every hour. It's also water resistant, available in a range of colors, and syncs automatically to their online fitness community, letting you log miles, compete with friends, and more.

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