Just try this. It is from an orthopedic surgeon. Most people end up unable to do it as accordingly. How about you? Give your best shot.
1. While sitting where you are at your desk in front of your computer, lift your right foot off the floor and make clockwise circles.
2. Now, while doing this, draw the number '6' in the air with your right Hand. Your foot will change direction.
p/s : can you do it or can't?