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en.wikipedia.org/wiki/Marathon

The marathon is a long-distance running race with an official distance of 42.195 kilometres (26.219 miles, or 26 miles 385 yards), usually run as a road race.

running.competitor.com/2013/09/training/3-reasons-why-you-should-not-run-a-marathon_42291

Sep 18, 2013 ... Interest in running a marathon is booming, but it might not always be in a ... your marathon racing plans might pay off for you in the long run.

www.huffingtonpost.com/2013/10/29/why-not-shouldnt-run-marathon_n_4171186.html

Oct 29, 2013 ... Research shows that after long, taxing workouts like marathons, immune systems are depleted for up to weeks after the race, leading to “2-6 ...

www.runrocknroll.com/tempo/education/marathon-distance-infographic

Rock 'n' Roll shares innovative ways to measure marathon distance! ... such a long time, you'd probably get so bored you'd wish you were running a marathon ...

www.livescience.com/11011-marathons-26-2-miles-long.html

Apr 19, 2010 ... As the 114th Boston Marathon goes down in the history books, ... So, you want to have a really long race that eventually will attract the best ...

wonderopolis.org/wonder/how-long-is-a-marathon

Who holds the world record for the fastest marathon run? ... They're all contests, events, or happenings that were exceptionally long or required great endurance.

www.runnersworld.com/running-tips/6-rules-to-determine-how-many-miles-a-week-to-run

Jul 5, 2016 ... Whether you're planning to run a 5K, 10K, half marathon, ... mostly run long, slow miles, you will become proficient at running long, slow miles.

www.telegraph.co.uk/women/health/10-things-no-one-tells-women-before-they-run-the-london-marathon

Apr 21, 2016 ... In fact, a marathon is pretty much one long jiggle-fest from start to finish. And the more voluptuous you are, the more problematic this is.

www.history.com/news/ask-history/why-is-a-marathon-26-2-miles

Oct 29, 2014 ... The marathon may have ancient roots, but the foot race's official length of 26.2 ... 776 B.C. to A.D. 393, never included such long-distance races.

www.outsideonline.com/1856916/9-toughest-ultramarathons

They're extra long, incredibly tough, and take the type of commitment and logistics ... this list, but the Barkley Marathons is up there with the world's craziest races.