my back is obviously on it's own agenda HA

so I've noticed my back feels like two metal pipes down my spine. I definitely feel I am getting a stronger core thanks to (CFNC) crossfit. but getting ready for bed I saw this in the mirror when I was changing shirts. what are these creatures called. back buldges, spinal fences? the trenches? lol ok just wanted to share cuz they look crazy. nite!