Seems the central point relates to insufficient internal shoulder rotation as mentioned in Stumfel's article.
Also she does not twist her core and point her chest up towards the ball, which the men do. Women focus more on jumping up. Stosur and Serena are exceptions.
Martina Navratilova did it right: https://www.youtube.com/watch?v=zkqA_NvvnoU
or watch Martina and Sabatini, both serve beautifully: https://www.youtube.com/watch?v=dSslLj_C7Yg
Also she does not twist her core and point her chest up towards the ball, which the men do. Women focus more on jumping up. Stosur and Serena are exceptions.
Martina Navratilova did it right: https://www.youtube.com/watch?v=zkqA_NvvnoU
or watch Martina and Sabatini, both serve beautifully: https://www.youtube.com/watch?v=dSslLj_C7Yg
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