Your sacrum is the back door of your pelvis — is it stuck? If the sacrum is stuck, moves asymmetrically, or only moves in one direction, birth can be harder. Why? Because the sacrum is part of the pelvic wall. When it rocks forward (nutation) or back (counternutation), it changes the shape and space of the pelvic inlet, midpelvis, and outlet — exactly where your baby needs to pass through during labor. Here’s the catch: Common moves like Cat-Cow initiate from the spine, creating spinal flexion a