You know how it goes in the celebrity world - one of them gets into some sort of exercise or religion and then the whole crowd follows suit.

This year's newest trend? Triathlons of course!

Last month Jennifer Lopez completed a triahtlon in Malibu, albeit under suspicious circumstances.

Now, on Sunday, Matt Damon competed in the running portion of Florida's Escape to Miami, teaming up with his stepfather Jay Jones and family friend Barry Hetherington.

Damon said his Ironman-hopeful brother talked him into the race as a way to get back into shape after gaining weight for the film The Informant. He said he needs to be in peak physical form for an upcoming project. A fourth Bourne, perhaps?

He admitted that he's still got a long way to go.

"I knew I was in trouble when the old guy with the oxygen tank passed me," he said.

When asked if he'd trade up his favorite pastime of boxing for running, Damon said he didn't think so. His stepfather joked that Damon was the "team's weakest link."

Damon came in 27th place of his leg of the race, greeted by wife Luciana Bozán Barroso and the couple's newborn daughter Gia and a couple of fans who were more than a little surprised at Damon's presence. After all, he was a late entry into the race.

It was Edgardo Velez - a 20-year old student at the University of Puerto Rico in Poncé - who took the prize for Escape to Miami.

Maybe next time, Matt!

[Image via Pacific Coast News Online.]