I was writing to ask some questions regarding the service motion. I have viewed the Sonic Serve video and read posts about serving here but still had several questions if someone could help me with. 1. If I stretch my hip into the court right now I do not get as much knee bend as some of the players I see. Is it all right to flex the knees more after the front of the body is fully stretched or are the pro players so flexible that they can get a great amount of knee bend by just stretching the front part of the body. 2. In the set to launch position when I am coiled up. The racket tip is pointed up and then the forward motion starts from the ground up driving the racket around with the tip pointing towards the ground then the arm straightens to hit the ball. It feels to me when I do this that I am going in two directions at once legs and hips pulling forward while the racquet is going back and around. Is this pulling feeling the correct motion to have? The only problem I have with this pulling motion is my shoulders seem to open too early. Should I stick with this motion and just try and keep my shoulders closed longer? 3. My final question concerns weight distribution. I have read big servers push against the ground at a force up to 3 times their body weight. In viewing Andy Roddicks serve he seems to get more height off the ground using his legs than other players. To get this lift he seems to push off with both feet. Does this mean his weight distribution is not primarily on his left foot as with most servers or is he just pushing against the ground harder than the other players. Any assistance would be appreciated, Thank you.