Exert only enough tension on the tape to maintain contact between the tape and the skin. The tape will span body hollows in this measurement. The measurement is taken at the maximum point of quiet respiration. This must be a horizontal measurement. Scye at midspine.
Subject stands erect looking straight ahead in front of a mirror.
The heels are together and the weight is equally distributed on both feet. The subject puts both fists on the tops of the hips. Place a tape around the torso, passing over the drawn scye level at midspine landmark. Use the mirror to check the position of the tape as it crosses the subject's back. After the tape is in place, the subject drops the arms to the sides with the palms facing the thighs.