Bound forward as far as possible on one foot at a 45-degree angle, alternating sides as if skating for 20 yards. Keep your hips over your knees. Do five sets of 20 yards, with a two-minute rest between sets.
Credit: Illustration by Jason Lee
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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