A narrow sensor fitted into a removable rubber bracelet, the Fitbit Flex is light and inconspicuous, and accurately tracks steps, calories burned, and sleep (it did overcount on certain days). It could be seen as a better version of Nike's FuelBand, which tracks only steps and calories. We wish it had an LCD screen and an altimeter (it doesn't track stairs traveled). [$100; fitbit.com]
Credit: Photograph by Plamen Petkov
The 2014 Adventure Issue
From Iceland's Highway 1 to Utah's Canyonlands, an epic itinerary for modern explorers.
Plus: Building a Bigger Action Hero
ON NEWSSTANDS NOW
Duke Lacrosse and the Fog of Scandal
How Thailand's Most Notorious Prison Became a Fight Club
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