Digital Atheist
Hall of Fame
I think the latter part of this is key. "Earlier activation" of lower body muscles. If you watch videos of pro serves, they use leg drive to initiate the racquet drop out of trophy. Their knees are fully extended as the racquet reaches full drop.
The average rec player thinks of it differently. Even some WTA pros have the concept wrong. These players think leg push is used to help shotput the racquet up to the ball. Hence they fire their legs later than elite servers.
Push versus pull anyone?? Radical concepts like the kinetic chain are discussed in the following article, so it might not be for everyone, but I found it interesting:
http://www.aspetar.com/journal/viewarticle.aspx?id=6
And then there's this, which seems connected:
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