Therefore, the sacrum being the very bottom of the spine, the base of the spine between the pelvis and then the cranium being up here and primarily it's the occipital bone that will create that pumping motion. (pregnancymagazine.com)
Headbands are the small pieces of cloth or silk found at the top and bottom of the spine on hardcover books. (edwardsbrothersmalloy.com)
Try sticking a pillow under the hips and lower abdomen to give the bottom of the spine a boost. (greatist.com)