Your abs are part of your core, together with many other muscle groups. We can divide the core in two sets of muscles; the inner and outer core.
The inner core includes the transversus abdominis, pelvic floor, diaphragm, quadratus lumborum and multifidus muscles. These muscles work together to stabilize the spine and pelvis, and help reduce any twisting potentially hurting your body.
The outer core is comprised of the rectus abdominis, internal and external obliques, and erector spinae. These muscles work together so you can flex the spine, complete lateral flexion and help maintain an upright position.