The Iliocostalis is a muscle located in the lower back, part of the erector spinae group. It plays a crucial role in maintaining posture and supporting the spine. The muscle extends from the pelvis to the ribs and is involved in movements such as bending and twisting the torso. This muscle is divided into three sections: the iliocostalis lumborum, iliocostalis thoracis, and iliocostalis cervicis. Each section corresponds to different regions of the spine, helping to stabilize and move the vertebral column. Strengthening the iliocostalis can improve overall back health and reduce the risk of injury.