Abs is used as a short term for abdominal muscles. The abdominal muscles comprise three distinct muscle groups. The chief muscle set is located in the front of the torso region in the body. It’s divided into eight blocks and is known as rectus abdominis. Obliques, the next muscle group is on the lower side of the torso just above hips. Whereas, the third group locks into the rib cage and is called Seratus.