Thicker spinal segments tolerate compression better than bending, while thinner segments tolerate bending better than compression.

“the thicker stick can bear tremendous compression but it doesn't tolerate bending so you look at the neck very thin uh uh small diameter vertebra it's made for bending and Mobility fabulous but as you move down the spine and get to the bottom two where the thickest is they do not tolerate bending near as much as they tolerate compression”