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There are record applications for marathons. So why do I hate running?

Running is more popular than ever, but CNN health writer Madeline Holcombe can't get past loathing it. After seeking advice from an Olympian, she spent one month preparing for a local 5k race.

3:12 • Source: CNN
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There are record applications for marathons. So why do I hate running?
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1972: In this handout from the Centers for Disease Control and Prevention (CDC), a histopathology of measles pneumonia is seen in this microscope image from 1972. Measles outbreaks have been reported throughout the U.S., with the latest reported February 5, 2015 at a daycare in suburban Chicago where as many as five children under the age of one have been infected. (Photo by CDC via Getty Images)
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