"Follow through" refers to the movement of the drawing hand and arm after the release.
Once the archer has released the arrow, nothing should move. The archer must give the arrow time to clear the bow. To insure this, instruct your archers to wait until the arrow hits the target before moving at all. In the picture you can see that my release hand goes in the exact opposite direction as the arrow. Making sure that your shoulders don't collapse is very important. Also, notice that I am still aiming, long after the arrow is gone.
