Stress is not the enemy in our lives. Paradoxically, it is the key to growth. In order to build strength in a muscle we must systematically stress it, expending energy beyond normal levels. Doing so literally causes microscopic tears in the muscle fibers. At the end of a training session, functional capacity is diminished. But give the muscle twenty-four to forty-eight hours to recover and it grows stronger and better able to handle the next stimulus.
