Ball tossing arm motion.

[wwong]

Seems to me when the pros serve, their ball tossing arm are like in slow motion. Yet they can place the ball to the right height. I feel like I have to move my arm fast to achieve that, which causes inconsistent location and body balance. How do they do it?
Thanks in advance.

 

[SageOfDeath]

its because you're not used to tossing slowly, just do it until you get used to it. Here's a good link for the serve.

http://groups.msn.com/TennizFriendzSingaporeTFS/tennisanalysis2.msnw