True! Our bodies need a balanced workout to be at its best. We need to have cardiovascular work for the heart and the lungs: strength training for the muscles, tendons, ligaments and to build bone density. It also means balance work and of course flexibility training. When we sit, we tighten up or conform to the seated position; we need to stretch out the hip flexors that get chronically tight from sitting. We need to strengthen the back muscles and the butt that get stretched out by sitting. We need to get our bodies back into the proper shape or alignment when we do activity or lack of activity to change and deform them. When you stretch a strengthened muscle, you give it a long lean look and enable the body to work at its best and most mechanically advantageous point. You work the joints in a full range of motion when you are stretched out, and avoid overuse of a joint or muscle when it is shortened and tightened.