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Old 12-25-2010, 12:51 AM   #19
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Default Different Serves and Armís Actions

2.2 Different Serves and Arm’s Actions

There are a lot of speculations about the wrist movement (the wrist snap, the wrist whip effect) during the last second before impact. Some of the tennis specialists (Vic Braden etc) say no such thing occurs. But, others (Brian Gordon and so on) insist the wrist motion is very important. But what do the arm and the wrist in particularly really do? When I’m serving I feel like my wrist is doing something very essential, however maybe my feelings mislead me. But, the pictures never lie.

2.2.1 The Kick Serve with Effective Pronation, Wrist Ulnar Deviation, and no Wrist Flexion

This time, I’m going to analyze the pictures from Figure2.10 and Figure 2.11. They show the set of the video’s frames taken during the Lleyton Hewitt and Andy Roddick kick serves. Let’s pay attention to the wrist motion

Figure 2.10. The wrist at the last second before impact Lleyton Hewitt’s kick serve

Figure 2.12. The wrist at the last second before impact Andy Roddick’s kick serve

These players employ the Continental grip. From above pictures we can see the racquet string plane has practically constant vertical orientation. On all pictures, the hand is almost straight out and there is no extension or flexion of the wrist before and for the duration of the impact.
At the same time the wrist ulnar deviation directs the racquet upward very fast. The pictures show this movement takes place in the plane which coincides with the racquet string plane. Hence, it can produce the brushing boll motion only. But, the brushing motion mostly responsible for the ball rotation, not for the ball speed. The wrist ulnar deviation might be used to create different types of the spin serves and this is a very good option. Nevertheless, it also can decrease pronation efficiency, the most important part of the tennis kick serve.
OK, so far I don’t see any wrist actions in the kick serve which could add any real speed to the tennis ball, but only the spin!
To be continued, see please post #62.
Anatoly Antipin - one of the most delicate tennis players in the world.

Last edited by toly : 05-27-2013 at 12:53 PM.
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