Columbia Muddy Buddy Ride & Run Series = Enlist a pal, bring a bike, and psych up to ride and run over a 6- to 7-mile trail. One of you begins on two wheels, the other on foot; you swap activities each mile, conquering not-too-gnarly barriers (like scaling a cargo net) in between. Then the dirty finale: crawl side-by-side through an 80-yard mud pit.
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