The lower back & Sacrum is the yang portion of what yoga calls the “solar plexus” center. This center is our power center. With its strong muscles and thicker, bigger vertebral bones, this region does a lot of the heavy lifting involved with our day to day physical activities. That said, if our physical activity level is low, this region begins to degrade. While over-working can cause it troubles, it likes to work, and generally suffers more when it is not being challenged to be empowered in one’s life.