The abdominal muscles are made up of four muscle groups. These are the rectus abdominus, transversus abdominus, internal oblique, and external oblique muscles. This group of muscles help to stabilize the trunk, provide organ stability, and assist in flexion and rotation of the trunk. Strengthening these muscles helps support the body's frame and decreases back injuries. Click on the links below to learn easy exercises to help strengthen your abdominal muscles.