James Marsden & Josh Hopkins Compete in a Triathlon

Rex-USA; Seth Browarnik/StarTraks

04/03/2012 AT 5:50 AM ET

James Marsden competed in the Nautica South Beach Triathlon (to help raise money for St. Jude’s Children’s Hospital) – and he had some celebrity support at the event. Cougar Town’s Josh Hopkins convinced him to participate, he told fans. Marsden was part of a relay team and did the bike portion of the event. And he must have competed well: his team took first place in their division! Unfortunately, though, Hopkins injured himself on the final leg and wasn’t able to do the four-mile run. – Joey Bartolomeo

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