"Physiologists and high-performance trainers understand now that the concept of 110 percent is no longer a smart way to train. Fitness is like the blade of a knife; you want to sharpen it without ruining the blade. Give 110 percent, and you won't build your body up, but actually break it down. And be no good to yourself or anyone else."

--
Sally Jenkins

#Smart #Knives #Giving

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