If you've ever run a marathon, survived a natural disaster, or given birth, you know that your body is capable of much more than you think. One U.S. Navy SEAL has formalized this idea into something many call the 40 percent rule. That is, when your mind says you're done, you're only 40 percent done.
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Hear about the rule from Itzler himself.
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Written by Ashley Hamer February 6, 2017
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