Unless you have something different about you, you have a inward curve in your lower back and it should not be made to disappear. However the lumbar curve in some people can be over exaggerated! This is not a problem if there is not back pain. But due to something called Reciprocal Inhibition, by curving your back that far the abdominal muscles turn off. This creates a less than optimal situation for lifting things. The opposite is also true! You basically want your pelvis somewhere in between t