Have someone throw a ball or other object to you while you are standing on one foot (you can also bounce a ball off a wall if you're training alone). (hardgainermusclebuilding.com)
Now, a character progression system is in place which, through countless hours of bouncing the ball in the vast array of available tables, nets experience points. (cubed3.com)
Everyone knows the scene: a basketball player at the free throw line, bouncing the ball as he concentrates on the basket. (sciencedaily.com)