mastering the forehand loop

...........When you loop you should have your shoulders roughly squared to the table at the start and then rotate them roughly 90 degrees back, and end up facing the table again.  The more rotation, the more power and the more your arm can stay relaxed and whip through the ball.  This means that your upper body is rotating more than your legs.  A good loop should have roughly twice as much rotation in the upper body so as to really wind up and uncoil on release.  Once you understand how important rotation is to successful looping then you can focus on other aspects...............