I did my first AFF jump out of Mike Mullins King Air. Upon exit, my main-side jump master got whipped beneath me, which sent all three of us into a roll. My only thought was I have to arch to get out of this. I arched as much as humanly possible and the video is amazing. The roll lasted 5 seconds. And you can CLEARLY see that as soon as I went into my arch I came out of the roll. So it is true, your arch is your stability. Of course, relaxation doesn't hurt either.