Two techniques of waist reduction which utilize the external oblique abdominis muscle are described. The first method superimposes the external oblique abdominis muscle, and involves making an incision in the muscle inside the anterosuperior iliac spine, continuing obliquely upward toward the midaxillar line, lifting the flap by its deep side. The technique is completed by crossing and superimposing each muscle lamina over the other. The second method creates a muscle belt by lifting the external oblique abdominis muscle and an aponeurotic muscle flap from the area deep to the superoanterior iliac spine as an upper pedicle. The remaining ends, separated from the muscle, are approximated to each other and sutured. The aponeurotic muscle flaps are carried forward to be crossed and superimposed in the midline under the umbilicus as a belt.