Connective Tissue

I realized this morning that although I have described three out of the four muscles of the abdominal group, I forgot to mention one of the most important materials to allow muscles to provide their proper function: The connective tissues.
In the case of the abdominals, the type of connective tissue is called fascia, and its main function is to provide a muscle attachment point to the other muscles and also the bones of the trunk, hip, and lumbar spine. Its structure consists of strong collagen fibers with minimal elastic properties, secondary to having to stabilize the lumbar spine and prevent increased torque that could increase the risk of injury. It connects the muscles of the rectus abdominus to the lower ribs, upper pelvis, and also the oblique muscles. The obliques then connect posteriorly to a large fascial sheath called the thoracolumbar fascia which encapsulates the strong extensors of the lumbar spine and attaches to the lumbar spine. Upon contraction of these muscles, their fascial attachments tighten and distribute the force over the joints leading to motion.
Core stabilization and strengthening exercises not only strengthen the muscles, but also the fascial connections, and should always be a part of well rounded fitness routine.