The spine consists of bony segments (vertebrae) and intervertebral discs that allow for mobility and some compression.

“the back is made up not just of bony stuff but it's got stuff in between which are the discs the discs are the soft tissue that sit between the vertebrae right the vertebrae of the bones and those discs have some durability to them they're they're not easily squished but they can be squished that is they can move they're a soft tissue that allows for mobility of the Bony stuff so you've got basically bone disc bone disc bone disc bone dis and it's those discs that allow for movement of the spine from side to side and it actually allows for some compression along the length of the spine as well”