Originally Posted by toly
Thanks for comments.
Serena uses very actively ISR before and during impact but smoothly. I donít see any abrupt sideway acceleration and it is practically impossible. She really pulls in because of ISR, but it has nothing to do with Wegner description of modern FH.
I think Serena uses a combination of ISR and biceps, pretty late in the stroke (close to contact), hence one might say it's abrupt. But that doesn't really matter. In answer to your question on how to create a linear stroke, notice how the path of the racquet head is pretty much linear for most of the stroke. It becomes circular close to contact due to her ISR and biceps action. Now ask yourself, if the ideal stroke is totally linear, why should Serena change a good thing (linear motion) into a bad thing (motion in an arc), and so close to contact at that? Could it be because the act of pulling in the racquet increases RHS both forwards and upwards?!