Since most running shoes have well-padded heels, it's easy to take long strides and land on your heels. But that hard impact sends a shock wave ripping through your body, which can cause long-term injuries.
Credit: Josh Humbert / Getty Images
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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