Get comfortable with it. If you’re not failing, you’re not getting better. And if you’re not getting better, you’re
getting worse. The basis of this idea is sometimes referred to as the SAID principle: specific adaptation to imposed demand. It means your body will only adapt to the exact demands you place upon it, and it will only do so until it can meet
those demands comfortably. As soon as the work can be done with ease, your body will stop adapting. Therefore, the only way to keep improving is to continue to fail.
-Blair Morrison, CrossFit Journal: Fitness is….Exposure and Impartial
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