For every inch that the head moves forward in posture, it increases the weight of the head on the neck by 10 pounds, which greatly increases the likelihood of head and shoulder tension, pain, and injury. Try to stand and sit up straight.
Increase your spinal flexibility and range of motion. Expands your chest and shoulders. Relieves thoracic or mid back spinal tension. Strengthens your abdominal oblique muscles. Stretches your hip rotators and hip, (Thoracic Back Pain)