kverens: This trick is used by a lot of ball-spinners and toss jugglers. What makes it more difficult for us is the size of the ball... if you are learning this from scratch, I recommend you first learn it with a soccer ball or basketball , then work your way down to an acrylic. When the ball reaches the first shoulder, try nudging it slightly in the direction of the second. This will help you keep up the momentum needed to stay on the same height so the ball doesn't just drop from the chest to the elbow without going near the second shoulder. You'll find it easier to do the chest roll if you lean back. This creates a more flat area for the ball to travel along. Surprisingly, you will find it smoother to roll from your bad hand to your good hand, because the hardest part is rolling from the chest to the receiving hand.