Okay, I did it … and I wonder if I didn’t do it right, because it was easy. I made sure to keep my hands suspended above waist level, no resting on anything (and made sure my upper arms were always a bit extended, so they weren’t carrying any weight against my torso).
Mostly I did figure-eights in the air at chest or eye level. Sometimes, I just fluttered my fingers rapidly. One of the cats was riveted by this performance.
I’m either lucky, or I was doing it wrong.