Points to look for:
- The player has dropped his elbow while raising his bat, which is a very different motion from the typical forehand pendulum serves.
- The player is also bending his knees to get his body low enough to perform the serve comfortably, and so that he is not contacting the ball too high above the net, which would make the ball bounce too high as well.
- The free arm is now well out of the way, giving the receiver a clear view of the server's contact with the ball.
