https://www.facebook.com/AlexLelyPool/ here i posted a link to a video of one of my safety-exercises
or Youtube > Lelytube
or Youtube > Lelytube
Put the cue ball and 2 object balls on the table. Hit one, get behind the other. Get a point if successful. Opponent gets a point if he kicks and hits. If he kicks safe he gets 2 points. Back and forth. Play to 21.
Used to do it for hours. MASSIVE improvement in cueball control.