What you need to know ahead of this year’s Boston Marathon
CNN -

The 128th edition of the Boston Marathon takes place on Monday with 30,000 runners from over 100 countries expected to participate. The race, held annually on Patriots’ Day, starts in Hopkinton and finishes on Copley Square, covering 26.2 miles and 248 meters (almost 814 feet) of elevation gain. Despite being net downhill, the undulating course and often unforgiving weather make Boston one of the more challenging of the world’s six major marathons. Here’s what you need to know ahead of this...

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