the.com/intercostal
The muscles between your ribs, hard at work whenever you breathe or laugh too hard.
means Located or occurring in the spaces between adjacent ribs, especially the muscles that help your chest expand and contract.
from From Latin inter (between) plus costa (rib) — literally the in-betweeners of your bony cage.
Breathing crewThree layers lift and lower ribs for breath.
That stitchSide cramps while running often involve them.
Sailor cousinCosta also gave English coast, the land's rib.