crystal_clear
Professional
No you may not!
The reasons are long and complicated.
Do as I request and you will soon see quick improvement, my guess, in less than one hour. Then, your interest in "why" will go away. I cannot help you if you have little confidence in what I ask.
You have other issues that should be immediately changed, but they are a bit more complicated. I will explain them though, when the time comes. You must make these small changes first.
You have nothing to loose and plenty to gain!
I will say this, continue along the lines of which your going and your serve will not improve greatly. You may also be in line for an injury. Especially if you start serving harder.
I see no advice, from others, that is of any immediate benefit. In fact, some advise is incredibly incorrect.
Watch how my advice will be attacked.
One change at a time, starting with the easiest first.
Now don't think, just go do it!
JS #1
ha, I am so scary.
Thank you JS for taking time to give me the advice. I feel more motivated to make changes if I understand the mechnism behind it. I might not fully understand "Do bend the racquet arm at the elbow, but don't lead with it by bringing it back. Doing this puts the elbow behind the body." I thought low elbow and behind the body is the right way to increase swing path before contact. I am confused.