1. While sitting at your desk, lift your right foot off the floor and make clockwise circles.Wait, wait, now I just wheeled away from my desk and did it in the middle of the room where I could have my foot making big circles and my hand making a large 6. Then I could do it no problem, where I'm confident I was making a 6 and my foot kept going clockwise. Part of the things that's hard is trying to keep track of what both parts of your body are actually doing so you know whether you've done it all.
2. Now, while doing this, draw the number "6" in the air with your right hand.
3. Your foot will change direction and there's nothing you can do about it.
Update: A reader from Bukowski, IA asks "Is it cheating to start tracing the 6 from inside its belly?" Yes, that's cheating!