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]
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56 Perfect Things
Tech, Tools, Toys, & the Hottest New Gear
Plus: The Deadly Thrill of BASE Jumping
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