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'Run Swiftly Racerback and the Run Team Spirit Crops: sea gaze' photo (c) 2010, lululemon athletica - license: http://creativecommons.org/licenses/by/2.0/

Your body is designed to adapt to stimulus. If you keep doing the same exercises and training, your body will become accustomed to it. It will gain only enough to deal with that stress and then quit improving. If you keep changing the exercises and training, your body will have to keep adapting and growing. It’s like a carpenter who swings a hammer for 20 years of his life. His forearms did not keep growing the whole time. They grew enough to handle that stress and then quit growing.”

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