Originally Posted by connico
I like how this is phrased.
To emphasis the feeling, practice throwing a ball and feeling that extension.
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.