Celebs Who Run Marathons

Music mogul Sean "P. Diddy" Combs ran the 2003 New York City Marathon, raising over $2 million for charity in the process. "I've never experienced mental or physical pain like that," Combs said of the marathon.

Ryan Reynolds took part in the 2008 New York City Marathon to raise money for Michael J. Fox's Foundation for Parkinson's Research. The actor ran in honor of his father Jim, who suffers from Parkinson's disease.

You oughta know that back in 2009, Alanis Morissette ran two marathons. The first was the Bizz Johnson Trail Marathon in California, in which she ran to benefit the National Eating Disorders Association, and the second was the New York City Marathon, which she ran as part of the Maasai Wilderness Conservation Trust team.

Most people know Bobby Flay as a celebrity chef and restauranteur, but he's also an avid runner. The New York native has run in three New York City Marathons (2002, 2006 and 2010), and once told reporters that he ponders food during the events. “I change my menus on my runs," said Flay. "It’s a great time to think.”

Model Christy Turlington Burns faced a different kind of runway in 2011 when she participated in the New York City Marathon. Turlington ran to support Every Mother Counts, an organization that aids in safer pregnacy and childbirth practices across the globe.