Have you ever spotted celebrities in big marathons around the US? Or maybe you have just signed up for running events without even realizing that you may have been joined in by your most favourite movie personality?

There are celebrities too who, like normal netizens, enjoy joining marathons either as part of their fitness routine but also as a way to take a healthy breather from their busy work schedules.

Check out the next slideshow for the pictures of celebrities who are marathon achievers:

Shia LaBeouf

The 'Transformers' actor was seen running the Los Angeles Marathon last 2010. It was for a cause to render services to US veterans since his own dad was also once a Vietnam veteran.

Will Ferrell

The funny comedian joined the 2003 Boston Marathon with a respectable time of 3:56 for a distance of 26.2 miles. He usually runs with his wife. He also finished successfully other marathons namely the 2001 New York City Marathon and the Stockholm Marathon in 2002.

Ryan Reynolds

Actor Ryan Reynolds started training for marathon as tribute to his dad. He went through intense training before he even signed up for a New York Marathon. He finished his very first running event under four hours.

Sean Combs

Rapper P. Diddy signed up for the 2003 New York City Marathon to crush the marathon record of Oprah. He was able to raise about $2 million for various charities meant for kids.

Katie Holmes

The former 'Dawson's Creek' star finished the 2007 New York City Marathon, managing a 26.2 mile distance. However, many doubted her running performance since many say it would be hard to run wearing yoga pants in boot cut designs like she did.

Check out the slideshow for more popular marathon runners!

New York Los Angeles