"Top spinners" are fun and a great introduction to the question, "What is top spin?"
First, show players the spin the volleyball will have when top spin is created. Then, using the middle purple dot and the top purple dot, players can begin experimenting with the full arm and hand movement of sending energy or movement across the top of the volleyball. Players can work alone and discover the ball turning, either controlling the ball by catching it after contact or up against a wall.