Hi i got a few serve question I use a platform stance,when i watch most platform stance server, it seens like they bend the knee,and does not move their hip in to the court. In bollettieri's sonic serve video, it says that player should move their hip in first and then been their knee. But in the video it is teaching people how to serve with pin point stance. My question is that should platform stance serve move their hip in to the court? They are seen to been their knee first.