The Fitbit Flex lacks the heart rate monitoring, stair flight tracking, and built-in screen of some newer Fitbit models, but it's a great entry-level fitness band if you just want to shame yourself into getting 10,000 steps per day. [Fitbit Flex Activity Tracker, $75]

If you don't mind trading size for features, the original Pebble Smart Watch is about the same price today as well.

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