How to Achieve Good Posture
Standing. Hold your head straight, balanced evenly between your shoulders and with your chin parallel to the floor. Keep shoulders, hips and knees level and your feet and knees pointed straight ahead.
Sitting. Hold your head straight and erect, bend your knees and hips at 90-degree angles and keep your feet flat on the floor. Keep your lower back pressed against the chair.
Sleeping. Lie flat on your back, with a low pillow under your head and neck. If you sleep on your side, keep your ear, shoulder, hip, knee and ankle along a straight line. Place a small pillow between your knees.