6 Keys to Running Farther Than Ever Before | Men's Health: "t's National Running Day, so now's the perfect time to focus on building your endurance from an easy 25-minute jog and eliminating those walk breaks so you can go longer. Sure, it's tough to log a personal record every day as you progress as a runner. At a certain point, the huge gains in fitness are going to naturally level off, and that can be a letdown."
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