drill produces an action called the release (rolling over of the hands
and forearms). A proper release greatly helps generate increased clubhead
speed. Put a tee in the butt end of the grip on a mid-iron. Begin a slow
backswing. Stop when the tee in the grip points directly at the ball.
slowly through until on your follow-through the tee in the grip again
points at the starting ball position. Take some practice swings. Gradually
increase the speed of your swing making sure to go no further back or
further forward than your original positions. Now hit some balls.