Stand with both feet under hips. Shift your weight to the right leg, which should be nice and straight with a soft bend in the knee. Begin to drive your left foot back like you're stamping the bottom of your foot on the wall behind you, keeping your leg straight. Simultaneously, slowly start hinging at the waist, tipping your torso forward until it’s almost parallel to the floor. Keep your arms straight, at shoulder height, and perpendicular to the floor at all times. At the bottom of the position, your body should be in a straight line from the top of your head to the bottom of your left foot. Then, begin pulling your left leg forward while keeping it straight, and lift your torso up until you’re standing again. That’s one rep. Repeat all reps on one side, then switch legs.