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About 99 percent of the people who start marathons in the United States finish them. That's an astoundingly high number considering the pain and turmoil that every marathon runner faces. What each runner has in common, says author Jesse Itzler, is that they hit a wall where their mental resources are exhausted. At this point, sheer physical will maintains their strength — and this is the will that everyone has, but we seldom know how to tap into it. Itzler's way to break through his own mental barriers was
