The Finish    

There is a good drill that works marvelously on shaping groundstrokes.

On the forehand finish, touch the left cheek with the back of your right hand.

On the two-handed backhand, touch your right cheek with the back of your left hand.

The butt of the racquet will be pointing towards where you aimed the shot.

Do it gently but consistently.  It will improve your stroke.

Oscar Wegner,