The hands move in a circular motion. The left and right will alternate each time so on one pass the left will be closest to the body, the next time the right.
There is a good explanation and "video" here:
http://www.mnwelldir.org/docs/qigong/qigong3.htm
Although you really don't need to worry about timing your breathing as much as he indicates.
RodB
[This message has been edited by RodB (edited April 01, 2006).]
[This message has been edited by RodB (edited April 01, 2006).]