Originally Posted by dominikk1985
Throwing balls is a great training for serving (a guy that throws like a girl can't serve) however I think here this is not correct.
In a throw you start bent and then extend the arm into the release. In the FH this comes earlier at the end of the transition the arm will already reach full extension. It's more like a cricket bowler but with the bent arm takeback.
The exercise is to only experience the feeling of extension.