Bow: This posture completes the spine-strengthening series by working the lower, middle, and upper spine in tandem. Improves function of internal organs, liver, kidneys, spleen, large and small intestine. Increases elasticity ribcage and lung capacity and increases flexibility of the muscles of abdomen and shoulders. Revitalizes spinal nerves by increasing blood circulation to the spine. Strengthens muscles of the abdomen, upper arms, thighs, and hips.