04/10/2013 12:38 pm ET

Should Running A Marathon Really Be Everyone's Fitness Goal?

Running used to come with street cred. You got the head-clearing glory of those pre-dawn miles and plenty of fitness prowess was conferred upon you for it. Now, it seems everyone who laces up their sneakers is upping the ante and training for a full-blown marathon. When did running 26.2 miles become the brass ring of fitness? And should it be?

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