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Tips from the world's top runners

To participate in the Boston Marathon on Monday, April 15, runners must submit a <a href='http://www.baa.org/races/boston-marathon/participant-information/qualifying.aspx' target='_blank'>qualifying time</a> determined by their age group and gender. For those of us who didn't make the cut, CNN collected some training advice from a few of the world's top runners.

To participate in the Boston Marathon on Monday, April 15, runners must submit a qualifying time determined by their age group and gender. For those of us who didn't make the cut, CNN collected some training advice from a few of the world's top runners.