It's a large, superficial muscle that runs vertically down the front of the abdomen. It's responsible for many functions, including:

* Flexing the spine: It helps bring your chest towards your hips.

* Supporting the abdominal wall: It helps maintain the shape and structure of your abdomen.

* Assisting in breathing: It helps to control the pressure within your abdominal cavity.

* Protecting internal organs: It provides a protective layer for your internal organs.