A prolonged crouched or hunched position leaves the lungs with inadequate room to expand. It causes shallow breathing, reduces vital capacity and puts strain on the heart. It depresses and unbalances the circulation and contributes to headache, backache and aching neck, legs and feet. Poor posture is also associated with constipation and varicose veins. It often accompanies feelings of inadequacy, hopelessness and depression.
Good posture starts with the head, neck and trunk.
The head should be up as if linked to a star. Every activity should be accompanied by a sense of maximum lengthening of the spine. By concentrating on the head, neck and upper trunk, the rest of the body will tend to an erect, at-ease and balanced posture. 2 Good posture is not only related to our positions while inactive, but to the positions we assume while working. Correct lifting of heavy objects, for instance, can help prevent injury and low back pain.