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Old 12-03-2013, 11:41 AM   #9
Lukhas
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Join Date: Apr 2013
Location: France
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As a rule of thumb, consider that the elbow should be in line with the collar bone. Out and away from the body.

However, for your 9 y.o. boy to understand the serve, I'd recommend you make him throw balls upward instead. It's much easier to understand. Check this video of a young girl being taught this way, with excellent results.
http://www.youtube.com/watch?v=6EFWB18kPWY
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