
      Like Japanese artists tending to a bonsai tree, chiropractors can adjust the spine to achieve greater spinal alignment.
The ancient Japanese art form of growing Bonsai trees is  fascinating. Bonsai trees are essentially normal shrubs that have been  consistently stressed in a particular way for a long time to create a  posture which would never be found in nature. Depending on how the tree  is stressed while it grows, it may end up looking like a miniature  version of a full-sized tree, or it may end up looking like a wild  tangle of branches with twists and loops. To most people, "good posture"  simply means sitting and standing up straight. Few of us realize the  importance of posture to our health and performance. 
The human body craves alignment. When we are properly aligned, our  bones, not our muscles, support our weight, reducing effort and strain.  The big payoff with proper posture is that we feel healthier, have more  energy, and move gracefully. So while the word "posture" may conjure up  images of book-balancing charm-school girls, it is not just about  standing up straight. It’s about being aware of and connected to every  part of your self.
Posture ranks right up at the top of the list when  you are talking about good health. It is as important as eating right,  exercising, getting proper rest and avoiding potentially harmful  substances like alcohol, drugs, and tobacco. Good posture is a way of  doing things with more energy, less stress and fatigue. Without good  posture, you cannot really be physically fit. Without good posture, you  can actually damage your spine every time you exercise.
Ideally, our bones stack up one upon the other: the  head rests directly on top of the spine, which sits directly over the  pelvis, which sits directly over the knees and ankles. But if you spend  hours every day sitting in a chair, if you hunch forward or balance your  weight primarily on one leg, the muscles of your neck and back have to  carry the weight of the body rather than it being supported by the  spine. The resulting tension and joint pressure can affect you not only  physically, but emotionally, too, -- from the predictable shoulder and  back pain to headaches, short attention span, and depression.
Poor posture distorts the alignment of bones,  chronically tenses muscles, and contributes to stressful conditions such  as loss of vital lung capacity, increased fatigue, reduced blood and  oxygen to the brain, limited range of motion, stiffness of joints, pain  syndromes, reduced mental alertness, and decreased productivity at work.  According to the Nobel Laureate Dr. Roger Sperry, "the more  mechanically distorted a person is, the less energy is available for  thinking, metabolism, and healing."
The most immediate problem with poor posture is  that it creates a lot of chronic muscle tension as the weight of the  head and upper body must be supported by the muscles instead of the  bones. This effect becomes more pronounced the further your posture  deviates from your body’s center of balance.
To illustrate this idea further, think about  carrying a briefcase. If you had to carry a 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 your center of balance places 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 your center of balance and therefore the weight  is supported by the bones of the skeleton, rather than the muscles. 
In some parts of the world, women can carry big  pots full of water from distant water sources back to their homes. They  are able to carry these heavy pots a long distance without significant  effort because they balance them on the top of their heads, thereby  carrying them at their center of balance and allowing the strength of  their skeleton to bear the weight, rather than their muscles. 
Correcting bad posture and the physical problems  that result can be accomplished in two ways. The first is by eliminating  as much "bad" stress from your body as possible. Bad stress includes  all the factors, habits, or stressors that cause your body to deviate  from your structural center. Bad stress can result from a poorly  adjusted workstation at work, from not having your seat adjusted  correctly in your car, or even from carrying too much weight around in a  heavy purse or backpack. 
The second is by applying "good" stress on the body  in an effort to move your posture back toward your center of balance.  This is accomplished through a series of exercises, stretches,  adjustments, and changes to your physical environment, all designed to  help correct your posture. Getting your body back to its center of  balance by improving your posture is critically important to improving  how you feel.