We are creatures of habit. The way we move, eat, breathe are unconscious. At some point we can get into trouble because of those habits. Particularly the muscles we flex constantly become short and then weak. The fun thing about this is that those flexing muscles cause an opposite set of muscles to stretch or stay elongated and then weak. Good times start now. With short flexed muscles and long stretched muscles on the same joint a third set of muscles jumps in and tries to make your body move. When the third set burns out is usually when we start paying attention to our bodies. Often the joint or muscle tendon is screaming at you. Pay attention to what your body is telling you.