Originally Posted by jakeytennis
i'm trying to learn a palm down serve.
can someone help explain to me how to do it and how it adds power?
Keeping the hitting arm palm down avoids the "waiter's tray" position and gets you to the racket drop position smoothly so that you can then accelerate up into the serve for power.
The palm of the hand stays down on the take back and then comes up like you are going to salute.
Check this video.