Lift your right foot a few inches from the floor and then begin to move it in a clockwise direction. While you're doing this, use a finger your right index finger to draw a number 6 in the air. Your foot will turn in an anticlockwise direction and there's nothing you can do about it!
The left side of your brain, which controls the right side of your body, is responsible for rhythm and timing. The left side of your brain cannot deal with operating two opposite movements at the same time and so it combines them into a single motion.
Try this with your right foot and left hand and you should have no problem!via