In anatomy, the rectus abdominis muscle is located on either side of the midline of the anterior abdominal wall and is covered by the rectus abdominis sheath, which is a broad upper and narrower band of multifidus abdominis muscle.
The rectus abdominis muscle begins between the pubic tubercle and the pubic symphysis and ends at the anterior aspect of the fifth to seventh costal cartilages and the raphe of the sternum. It is involved in the movement of the pelvis and spine and prevents anterior pelvic tilt.
Because the abdomen is covered by muscle tissue, there is no strong skeletal structure to protect, so the rectus abdominis muscle also has the role of protecting internal organs. At the same time, it also has a role in maintaining negative pressure, assisting in breathing for labor and delivery, and defecation.
In daily life, you can exercise the rectus abdominis muscle through exercises such as sit-ups, supine straight leg raises, and right angle supports.