It is done for the express purpose of of speeding up the vortexes.
Children do it all the time when they're playing.
All that you do is stand erect with arms outstretched, horizontal to the floor. Now spin around until you become slightly dizzy. In other words if you were to put a clock on the floor face-up, you would turn in the same direction as the clock hands. At first most adults will be able to spin around only about half a dozen times before becoming quite dizzy. As a beginner you shouldn't attempt to do more.