The lowest position of a vertical drop
assuming that the picture/snapshot provided by Zepp is "correct"
Your video indicates that it is NOT.
My post is not a criticism of your serve.
The lowest location of a vertical drop of your post number 314 could be improved/"lowered"What I don't get is that apparently some users are happy with their 3D serve trajectories, whereas mine are often off the mark. Sometimes OK, sometimes way off, and I do not have any great variance in my stroke...
assuming that the picture/snapshot provided by Zepp is "correct"
Your video indicates that it is NOT.
My post is not a criticism of your serve.