The abdomen and lower back form the lower portion of the trunk or torso.

The abdomen is the center of the body. It is an important problem area for both women and men.

From an aesthetic point of view, the back is divided into an upper part and a lower part. The boundary between the two proportions is generally the smallest waist size. The upper part of the back corresponds to the expansion of the M. latissimsu dorsi, which decisively shapes the relief of the back. The lower part of the back corresponds to the rear waist region. The rear waist region has a decisive influence on the appearance of the buttocks (bottom)