Hi guys, I've played a tennis over 3 years so far. I've taken a quite amount of lessons at the last year before I got the elbow issue. Anyway my elbow is fine now so I want to improve my serve now. I remembered the basic serve motion. Toss a ball --> Trophy position --> Rotate arm and shoulder... go on. There are many videos for "how to serve in tennis" and watched them all. However I can't find the connecting motion between the trophy position and rotate arm and shoulder. I can't feel my weight to transfer into a ball when the racket hit the ball. Can you guys guide me and give a tip for practicing the serve? Thanks, Ryan.