Hold your position at the line until the ball leaves the pin deck. This does not mean that you should look like the Statue of Liberty but that all of your body is still after you have delivered the ball EXCEPT your bowling arm. It is swinging back and forth and will eventually stop without your help. Several good things happen when you do this:
You don’t miss any of your great shots because you get to stay at the foul line and watch them.
It builds the discipline of keeping your balance at the line and thus helping you make your shots repeatable.
If you’re falling off your shots, you won’t be completing them to the best of your ability because you get too concerned about not falling down and therefore cut your shot off short. Balance at the line is critical to a well-executed and consistent delivery.
Pins tend to fall more when they feel your icy stare.