The relationship between back pain and core stability are often directly related, but not often discussed together. In discussing the relationship between back pain and core stability the big question is, what is the core? To picture the region of the core, visualize a cylinder. The front of the cylinder is like your abdominals, with four layers of abdominal muscles, and if you go to the back, there you’ll find the back extensors, there are different layers of back extensors. On the bottom of the cylinder is your pelvic floor, and on the top is your diaphragm, which not many people pay attention to.