Stand with your legs slightly wider than hip-width apart, your feet parallel. Lift up arms and place both of your hands behind your head.
Making sure your elbows are pulled back and your chest is lifted, bend from your hips and bend your knees, lowering down to a sitting position. Once in sitting position, get down on your knees while maintaining the same form for upper body. When you are on both knees, reverse the movement and straighten back up.