Get a rubber band and with a marker put a spot on it. Loop it over your index fingers, in front of your body. Right finger at the top pointing towards the left and left finger at the bottom pointing to the right. Now slowly rotate your fingers like in Moving of the Yin and Yang. You'll feel the rubber band turning on your fingers and notice the direction the spot is moving.
Now, imagine that the fingers are your arms and the rubber band is the energy column. Now, just think when my hands move like this (the fingers), the energy columin inside my my body is moving like the rubber band. And the next time you do the Moving of the Yin and Yang you can just remember the rubber band experiement to imagine what is happening while you are moving your arms 
Alex
