Steep hills, with a 10 to 15 percent gradient, have a bigger strengthening effect but are more stressful on calves and Achilles tendons. Start on hills of 4 to 8 percent before progressing.
Credit: 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
The Interpreters We Left Behind
The Rise of Cyclocross
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