To illustrate this idea, think about carrying a briefcase. If you had to carry your briefcase with your arms outstretched in front of you, it would not take long before the muscles of your shoulders would be completely exhausted. This is because carrying the briefcase far away from the center of your body places an undue stress on your shoulder muscles. If you held the same briefcase down at your side, your muscles would not fatigue as quickly because the briefcase is closer to the center of your body and the weight is, therefore, supported by the bones of the skeleton, rather than the muscles.

A simple exercise to improve your posture is called the Wall Posture Exercise. To do this exercise, simply find a flat wall. Rest your back against the wall and scoot your heels, shoulders and head back until the touch the wall. Holding this posture, step away from the wall and try to hold this posture as long as you can while you go about your day.