Thrashing all over the place to keep you balanced, and as wide as possible to increase your roll stability. Now, after you have fallen off a few times, lie back on the table. Resume the turbulence. Sure you roll a bit left or right, and your reaction is now to straighten your legs, but what an enormous difference. To weight shift, you roll your hips - no need to lean your whole upper body over.
Many people battle with falling about in the harness.
Instinctively grabbing the risers. I know that for my first 50 flights I used to often hold onto the risers to steady myself. It seemed reasonable that if I could steady my body by grabbing the harness with my toes I could achieve the same effect. Since that would elicit some strange looks, there has to be an alternative. When I first started to use the speedbar I noticed that through minor turbulence, the glider seemed more solid when I used a bit of bar.