The goal of this tennis serve drill is to be able to toss the ball in a similar way regardless of where you want to hit your serve or regardless of the type of spin (topspin, flat, slice).
These tennis serve drills are very important to develop your skill on the tennis serve.
There are many crucial games in tennis that were decided solely on how accurate and how fast the players were. Service games are very important in the game of tennis. Losing a service game means you are already behind from your opponent. In tennis, it is easier to win your service game than to break your opponent’s service game.