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Fitbit (Sports Fan, Under $100)

For the more reluctant Sports Fan just getting into fitness, or even for the calorie-counting obsessive, look no further than this unobtrusive little gadget. The Fitbit ($99) is a small clip-shaped device outfitted with a three-dimensional motion-sensor that functions as a personal wellness indicator. With the device's ability to track calories burned, steps taken, and distance traveled, a Fitbit owner can take a graphical look at how long they spend moving versus being sedentary, and how their energy intake relates to their energy expenditure. Fitbit also attaches to the owner's wrist at night, and tracks restlessness and general sleep quality. (It also boasts a long battery life, and an elegant, minimal design.) All of this information is then uploaded with the Fitbit software, so the user has instant an overall picture of their daily health. While it's not designed to track calories burned while biking, the Fitbit is perfect for motivating and reinforcing healthy, active behaviors.