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Flickr/Route One For Life

Where: College campuses nationwide

“Bare because we care” is the motto of this fun run that challenges college kids on 70 campuses across the nation to strip down to their underwear and give the clothes off their backs to charity (as if they needed an excuse). The clothes they ditch at the starting line—prior to a near-streak across the quad—are donated to local shelters (200,000 pounds so far, and counting).