The other is to slightly turn your back to the advancing airplane and look back over your shoulder.
I started doing this when I was learning to fly until my instructor caught me at it and chewed my ***** good for it. He always stressed never using "cheats or gimmicks" to fly as they will let you down in an emergency. He was a pretty stern taskmaster but I think I'm a better flyer because of it. Fly the plane, don't let the plane fly you.
Good Luck,
Scott