Legs get tight and this stretch helps to loosen them up. Bending your bottom leg will help keep you from arching your back. If placing your head in your hand puts a strain on your neck, rest your head on top of your forearm. Do 1-3 sets, of holding for 15-60 seconds, or six to 12 breaths. Keep in my mind that doing both sides once = 1 set. Enjoy.