Seated, lift your right foot off the floor and begin making clockwise circles. As you continue making the clockwise circles with your right foot, draw the number 6 in the air with your right hand. What happened? For most people their right foot changes direction. As for me, I also keep knocking my shin into my desk.
The point being demonstrated here is that when one part of the body is doing one thing and another part of the body is off in a different direction, neither is quite effective… hmmm.