This 0.4-inch-thin-faced watch provides runners and cyclists with data including speed and heart rate (both average and max). Testers liked its post-training feedback ("up your interval speed!") but found the setup process too intensive. Plus, scrolling through its functions midrun proved to be a headache. [$340; polarusa.com]
Gear of the Year
The best tools, tech, and toys of 2013.
Plus: Lance Armstrong's Downfall
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