Oprah Winfrey1 of 11
Media mogul Oprah Winfrey was once an avid runner. In 1995, Oprah graced the cover of Runner's World as she became one of the most famous runners on the planet. She finished the 1994 Marine Corps Marathon with a time of 4:29 and talked openly about her weight loss during training. Her feat inspired viewers around the world, famously telling them, "Anyone can do it!"
Will Ferrell2 of 11
This celebrity may be known for his ability to make people laugh, but he is also an accomplished runner and marathoner. He currently has three marathon finishes under his belt: the 2001 New York City Marathon (5:01), the 2002 Stockholm Marathon (4:28) and the 2003 Boston Marathon (3:56). He reportedly still logs around four to six miles a few times a week, and says he especially enjoys the mental benefits of a solid running plan.
Alicia Keys3 of 11
In 2015, musician Alicia Keys completed the New York City Marathon with a time of 5:50:52. She ran the marathon in honor of her charity, Keep a Child Alive, which delivers AIDS medication to disadvantaged children and families in Africa. She said the worthy cause helped her push through the physical pain when the miles got tough.
It wasn't Keys' first time around the block, though. She actually ran a marathon in Greece in 2007.
Pamela Anderson4 of 11
The "Baywatch" star ran the New York City Marathon in 2013 and finished with a time of 5:41:03. She ran the famous race to raise money for the J/P Haitian Relief Organization, a nonprofit founded by actor Sean Penn. Anderson stated she barely trained for the race and had never been a runner, instead sticking to the elliptical machine or Stairmaster to prepare. Post-race, Anderson compared the experience to giving birth.
Kevin Hart5 of 11
Kevin Hart first turned to running after realizing the physical toll that his harsh stand-up schedule was taking on his body. In 2015, he began hosting impromptu 5Ks at the different cities he visited. They quickly grew in popularity, from 200 runners to 3,000 runners, and Hart eventually teamed with Nike to put on the runs on a larger scale.
Hart now runs a 5K in every city he visits, whether it's with others or alone, and maintains an impressive seven-minute pace.
Eddie Izzard6 of 11
Eddie Izzard is a famous runner if there ever was one. Earlier this year, the British actor and comedian completed an incredible 27 marathons in 27 days and raised nearly $2 million for the British organization Sport Relief, which funds numerous charities around the world. Believe it or not, the 707.4-mile streak was not his longest running accomplishment. In 2009, he finished 46 marathons in 52 days.
Ellie Goulding7 of 11
Ellie Goulding has been very open about her love for running. She recently told the The Huffington Post that, "Running is the basis of all the training that I do other than yoga…it's like an escape." The singer regularly goes for five- or six-mile runs (she's even invited her fans to join her!) and ran the Nike Women's Half Marathon in D.C. in 2013. She finished with a time of 1:41:33.
Mark Zuckerberg8 of 11
At the beginning of 2016, the Facebook founder and CEO kicked off his "A Year of Running" challenge, in which he encouraged others to join him as he attempted to run 365 miles during the calendar year. As he pointed out, while it may seem like an impossible feat, it's only a mile—or around 10 minutes—each day.
Zuckerberg has since been seen running all over the world and documenting his adventures on Facebook. The group itself has grown to well over 100,000 participants and is home to numerous inspiring stories.
Sean Combs9 of 11
Sean Combs, more famously known as Diddy, ran the New York City Marathon in 2003 with a time of 4:14:52 and accomplished one of his biggest goals—beating Oprah's 1994 time. The rapper prepped in just six weeks by cutting out partying, switching to a high-protein, low-carb diet and running up to 20 miles before tapering off. He also raised $2 million for New York City public schools and called the race a lesson in "self-discovery."
Natalie Dormer10 of 11
Natalie Dormer is best known for her acting on the hit show "Game of Thrones," but she is also a fast marathoner. The actress completed the 2016 London Marathon with a time of 3:51:21 and was disappointed that she had just missed setting a new PR. Dormer ran the 2014 London Marathon—her first—with a time of 3:50:57.
Though she may have not beaten her old time, she did raise $7,200 for ChildLine, a service provided by the National Society for the Prevention of Cruelty to Children.