Every year in the U.S., millions of people lace up their shoes, make their way to a starting line and race the 3.1 miles that make up a 5K. Hundreds of 5Ks are run every week across the United States ...
Which is harder: a 5K or a marathon? Ask a runner who specializes in either, and they’ll likely say it’s the other one. The truth is, both these distances can be seriously challenging—and training for ...
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