U.S. research published in the 'British Journal of Sports Medicine' suggests exercise causes immune-system cells to attack viruses. Scientists found that those who work out five days a week suffer about 50 percent fewer colds than those who do so only once or twice a week.
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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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