Stress position

A stress position, also known as a submission position, places the human body in such a way that a great amount of weight is placed on just one or two muscles. For example, a subject may be forced to stand on the balls of their feet, then squat so that their thighs are parallel to the ground. This creates an intense amount of pressure on the legs, leading first to pain and then muscle failure.

Captured Viet Cong soldier, blindfolded and tied in a stress position by American forces during the Vietnam War, 1967

Forcing prisoners to adopt such positions is a torture technique (enhanced interrogation technique) that proponents claim leads to extracting information from the person being tortured.[1]