Rating Newest Oldest. Best Answer: Abs is short for abdomen muscles, or stomach muscles. They are strengthened through sit-ups. Abdominal muscles The abdominal muscles are located between the ribs and the pelvis on the front of the body.The four abdominal muscle groups combine to completely cover the internal organs.The abdominal muscles support the trunk, allow movement, and hold organs in place by regulating internal abdominal pressure.or example, the right external oblique contracts to turn the body to the left. Internal oblique muscles – these flank the rectus abdominus, and are located just inside the hip-bones. They operate in the opposite way to the external oblique muscles.