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COLUMBIA, MD -- 5/20/12 - Pro triathletes swim out onto the course before the start of the race to warm up. Safety personnel on a paddle board try to keep up...The 29th Annual Columbia Triathlon. Endurance athletes participate in a 1.5K swim â 41K bike â 10K run with professional triathletes for a $30,000 prize purse. â¦by André Chung #AC2_6449