A wall sit is an exercise done to strengthen the quadriceps muscles. A similar physical activity, known as the jetliner position, is used as a form of torture. The exercise is characterized by the two right angles formed by the body, one at the hips and one at the knees. The person wall sitting places their back against a wall with their feet shoulder-width apart and a little way out from the wall. Then, keeping their back against the wall, they lower their hips until their knees form
