The waterproof Polar Loop ($110) tracks your steps and calories; after syncing via Bluetooth or USB cable, the iPhone-only app also features an Activity Guide that tells you specific things you can do to help you meet your daily goal (for example, going on a 20-minute walk). If you're sitting down for a while, the app will also remind you to get moving. On the bracelet, the display shows the words "Up," "Walk," or "Jog" depending on your activity intensity; you can also sync a heart-rate sensor to the tracker to help you more accurately track your movement. The Polar Loop is available in black, blue, or purple.
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