See photos from the races, ahead.
Natalie Dormer
Game of Thronesstar Natalie Dormer ran the 2016 London Marathon on April 24, 2016.
She finishedjust under 5 hours and 51 minutes.
Timothy A. Clary/AFP/Getty Images; Richard Drew/AP; Gary He/AP
Competing on Nov. 2, 2003, Pufffinished the coursein a little more than four hours.
Caroline Wozniacki
The tennis star ran the TCS New York City Marathon on Nov. 2, 2014.
Supported by her pal Serena Williams,Wozniacki finishedwith a time of 3 hours, 26 minutes.
Elsa/Getty Images
The actresscounted a timeof 5 hours, 29 minutes.
Ohnoscored an impressive timeof 3 hours, 25 minutes.
Ryan Reynolds
Reynolds competed in the ING New York City Marathon on Nov. 2, 2008.
Teri Hatcher/Instagram
The movie starcrossed the finish lineafter 3 hours, 50 minutes.
Christy Turlington
An avid runner, Christy Turlington has completed multiple marathons over the years.
Pamela Anderson
Pamela Andersoncompeted alongside thousands of runnersat the 2013 ING New York City Marathon.
Gotham/GC Images
TheBaywatchalum finished with a time of 5 hours, 41 minutes.
Hatcher alsoran the TCS New York City Marathonon Nov. 2, 2014.
She completed the 26.2 miles in a little more than five hours.
AP/REX/Shutterstock
Uzo Aduba
TheOrange Is the New Blackstar finished the 2015 Boston Marathon on April 20, 2015.
Adubaposted a timeof 5 hours, 3 minutes.
Valerie Bertinelli
Valerie Bertinelli ran in the 2010 Boston Marathon just days before her 50th birthday.
Karwai Tang/WireImage
The veteran actressfinished with a timeof 5 hours, 14 minutes.
Michael Stewart/Getty Images
Errol Anderson
Brad Barket/Getty Images
Alex Trautwig/Getty Images
Timothy A. Clary/AFP/Getty Images
Diane Bondareff/AP
Andrew Savulich/NY Daily News Archive via Getty Images
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Seth Wenig/AP
Peter Kramer/NBCU Photo Bank via Getty Images
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