At more than 26 miles, running a marathon is no easy feat, even for seasoned athletes -- but these challenges, open to the public, are known to attract contestants of all callings, including some of the world's more famous folk.

Take a look at these celebrities participating in full marathons.

Kevin Hart

Credit: Getty Images / Timothy A. Clary

FAMOUS FOR: comedian and actor, appearing in such films as "Ride Along" (2014), "Get Hard" (2015) and "Central Intelligence" (2016)

COMPETITIONS: New York City Marathon (2017) TIME: 4:05:06

Karlie Kloss

Credit: Foley / EPA-EFE/REX / Shutterstock

FAMOUS FOR: fashion model and entrepreneur

COMPETITIONS: New York City Marathon (2017) TIME: 4:41:49

Ethan Hawke

Credit: AP Photo / Kathy Willens

FAMOUS FOR: actor, appearing in such films as "Reality Bites" (1994), "Before Sunrise" (1995), "Training Day" (2001) and "The Purge" (2013)

COMPETITIONS: New York City Marathon (2015) TIME: 4:25:30

Pippa Middleton

Credit: Getty Images

FAMOUS FOR: sister of Catherine, Duchess of Cambridge; socialite

COMPETITIONS: Vasaloppet cross-country ski race (Sweden; 2012), Engadin SkiMarathon (Switzerland; 2013) Safaricom Marathon TIME: 3:56:33 (Kenya; 2015), Great Wall Marathon (China; 2016) TIME: 4:54:51

Bobby Flay

Credit: AP

FAMOUS FOR: celebrity chef, restaurateur, media personality

COMPETITIONS: New York City Marathon (2002, 2006, 2010) TIMES: 4:08:45, 4:10:41, 4:01:37, London Marathon (UK; 2017) TIME: 4:21

Mario Lopez

Credit: AP

FAMOUS FOR: co-star of the sitcom "Saved By the Bell," TV personality

COMPETITIONS: Boston Marathon (2002) TIME: 5:41:42; New York City Marathon (2011) TIME: 4:23:30

Will Ferrell

Credit: AP / Neal Hamberg

FAMOUS FOR: actor, starring in such films as "Step Brothers" (2008), "Anchorman" (2004), "Elf" (2003); former cast member of TV's "Saturday Night Live"

COMPETITION: New York City Marathon (2001) TIME: 5:01:56; Stockholm Marathon (Sweden; 2002) TIME: 4.28.22; Boston Marathon (2003) TIME: 3:56:12

(Pictured: Will Ferrell, during a news conference on April 20, 2003, in Boston. Ferrell was an official entrant in the 107th Boston Marathon.)

Katie Holmes

Credit: AP

FAMOUS FOR: actor, work includes films "The Ice Storm" (1997), "Batman Begins" (2005), "Thank You For Smoking" (2005) and the TV drama "Dawson's Creek"

COMPETITION: New York City Marathon (2007) TIME: 5:29:58

Christy Turlington-Burns

Credit: Doug Kuntz

FAMOUS FOR: supermodel, philanthropist

COMPETITIONS: New York City Marathon (2011. 2013) TIMES: 4:20:46, 4:35:32; London Marathon (UK; 2015) TIME: 5:29:58;

Boston Marathon (2016) TIME: 4:09:27

(Pictured: Christy Turlington-Burns, participating in a 3-mile run/walk around Agawam Lake in the village of Southampton on Aug. 23, 2009.)

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