Track Stars

New health monitors to help with your New Year's resolutions

Elizabeth Renstrom for TIME

Gadgets have a long and distinguished history of helping human beings be more sedentary (exhibit A: the TV remote control). But the latest generation of battery-powered wristbands and clip-on devices aims to reverse that trend, encouraging healthy activity by tracking how many steps you've taken and calories you've burned. Lark's $150 Larklife bracelet will even tell you to get off your duff: "Noticed you've been sitting for a while," its iPhone app chided me.

Far more engaging than any puny old pedometer, these accelerometer-equipped gizmos work with smart-phone apps and cloud-based services to let you monitor your progress and, unlike some...

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