With the pull of the growing abdomen, the tendency is for the top of the pelvis to start to tip anteriorly (forward), resulting in a more significant curve in the lumbar spine (the low back). As pregnancy progresses, the natural reaction to the heaviness in front and the pelvis tipping forward is to lean back and press the entire pelvis forward. Over time, this can result in a loss of the lumbar curve (the gentle curve in the low back) and a non-optimal curve higher in the spine. It can also contribute to a tight posterior pelvic floor, and glutes that no longer work as they should. This is not at all what we presented as optimal alignment with the ribs over the pelvis and the pelvis over the ankles. See figure 1.2 for an example of an abnormal curve.