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Old 08-17-2004, 06:30 PM   #10
fastdunn
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Join Date: Feb 2004
Posts: 6,294
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Hey, I kind of hope this discussion continues...

I can hit 60-70% of my full potential of my serve by serving
with arm action only. Shoulder joint, elbow joint and pronation
can contribute up to 70% of racquet head speed, I've read.
So these must be the primary muscle group for serving !

I do this sometimes when I lost rhythm on my serve.
Actually action at wrist joint contribute large amount for the
final racquet head speed simply because it's the joint closest to
the racquet ! But I guess it should not be intentional.
It should snap a bit naturally because the huge kinetic energy
is going up and whipping action at the end !

Any stiff joint will put a break on transfering kinetic energy
being built from bottom up. As I grow older, I don't lose
much of muscle power(up until mid 50s,I've read from somewhere) but I get less flexible
and thus the deadly explosiveness of my big serve is disappearing !!
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