First, it is critically important to know what not to do. Avoid those infamous stomach “crunches” and toe touches and any exercise or activity that involves twisting the spine or bending forward from the waist with straight legs.
Next, recall a mantra you may have heard often as a child: Stand up straight. Good posture — proper alignment of body parts when you stand, sit or walk — reduces stress on the spine. Lift your breastbone, and keep your head erect and shoulders back, all the while gently tightening abdominal muscles and maintaining a small hollow in your lower back.
http://www.nytimes.com/2011/
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