Eye tracking
When you are playing any sport with a ball or a fast moving opponent, it is important that you be able to follow objects without much head motion. Eye tracking helps you maintain better balance and react to the situation more quickly.
One way to improve eye tracking is to keep a book balanced on your head while following the flight of a ball or object that is thrown or hit.
Whit the book on your head, you can also follow a softball as it rolls slowly around the inside of a frisbee. After you master the softball, replace it with a faster moving baseball and then an event faster moving golf ball.