This is a really advanced tennis ball basketball dribbling drill because it combines four different moves into one dribbling drill. So not only do you have to execute the moves, you have to think about what move is coming next. In a basketball game you usually don't have much time to decided on what move you are going to use, so this is great for being able to have multiple moves to do at the same time.
If a defender steps up in front of you or goes in for a steal you need to be able to quickly use the appropriate move, or you are going to turn the ball over. This ball handling drill is going to help you work on four different moves that you can master and then use in a game situation.