A pleasing abdomen has toned muscles, firm skin and shapely contours due to the right distribution of fat. The abdominal muscles provide structural support to the abdominal cavity, protect the abdominal organs and also give counter-support to the spine. There are four major muscles namely: external abdominal oblique, internal abdominal oblique, transversus abdominis, and rectus abdominis.
Many women are unable to achieve a flat and toned abdomen even with proper diet and exercise; particularly after pregnancy or major weight loss. In many of them, the rectus muscles are separated or weakened. Some also have exercise resistant fat on the tummy and flanks as well. Abdominoplasty or tummy tuck is a cosmetic procedure which removes excess skin and fat from the abdomen and tightens the abdominal wall muscles to restore a firm and toned abdomen even in such subjects. However deep internal fat has to be lost only by diet and exercise.