Op meant that the topspin drive is similar to the ping pong.
In tennis, the art of forehand attack is based on WHEN the ball was hit. Ascending. Peak. Descending.
... and the discreet gap in between the 3 above stages.
Disregarding the player's arm, there are hundreds of angles in which a racquet face hits the ball.
Let's add the arm, add hundreds of styles.
Add the torso..
Add the feet...
Add the muscles...
Add the brain...
We will have thousands of sequences to hit the TopSpin Drive.