Thoracic rotation: This exercise is to improve thoracic spine mobility around a stable torso and shoulder. And to increase thoracic extension, your thoracic spine becomes tight and restricted from your daily activities. Most our daily activities are done in front of our bodies this causes your body to hunch forward and in a “flexed” position. http://rpm-therapy.com/2011/correcting-muscle-imbalances-exercises-part-2/