As you could see in the video my student Xu struggled with his first serves.
The main problem was that his ball toss location was too far over to the left.
He manged to fix this problem through the video analysis. Have a look at
the before and after pictures of his toss and contact point!
As you can see Xu now has a much better toss and a much better first serve.
Here is what he had to say to me via email afterwards: