The sides of the torso rarely lengthen in everyday activities yet need to do so to maintain good posture. Sit tall on a supportive chair, feet flat on the floor, tailbone weighted heavily on the chair. Exhaling, draw your abdominal muscles toward your lower back. Inhaling, slowly lengthen your left side, growing out of the pelvis and into your underarm. Let your right arm and shoulder drop toward the floor. When you feel your lower back engage stop. Inhaling, come back to center and repeat on the other side.