Stand near a low table, desk, or other firm surface that is about two feet high. Bending your left knee, place your left foot on the edge of the surface. Placing both hands on the middle of your left thigh to support your weight, lunge forward by leaning forward at your right ankle. You'll feel a stretch along the middle of your left thigh and over your left knee. Relax and return to the starting position. Repeat on the other side.