Posted by: tom.guerry (tom.guerry@kp.org) on Sat Nov 1 10:00:33 2003

The feeling I have, including the image I get in
my head as compared to video of what
happens,seems to confirm that,for me, in both
overhand throw and hitting there is a similar
sequence of arm action which likes to
synchronize with lower body action(Nyman
calls this synchronizing " mapping").Example
of sequence and mapping:

1-back arm and lead leg internally rotate
together as hip cocks

2-scap "load" (symmetrically in
throwing,asymmetrically in hitting).for
hitting,back scap(which includes shoulder
socket/glenoid) pinches toward spine as lead
leg goes out/abducts.The bat cocks toward
the pitcher as a resulty."THT" has not
started.Arm must also be stabilized in
shoulder socket as part of same
motion.Socket points more up for throwing
and down for hitting.This means more lift then
pinch for throwing,more pinch then lift(can't lift
as much after pinching) for hitting(usually get
elbow higher in throwing,although some
hitters get the elbow and hands very high
which ?can be a problem as Doug stated)

3-the back arm and front leg externally rotate
together,this immediately followed by internal
rotation of the lead arm begin torquing/
uncocking the bat,prelaunch tht begins.

4-launch sequence starts with drop and tilt(lot
going on here).load/unload happens with
initial increased separation before launch
actually gets underway(before tight connection
established).During this time,pre-launch tht
accelerates as back elbow continues down to
slot and lead arm finishes internally rotating to
get lead elbow fixed in plane of swing.Top
hand stays back relative to shoulder,bottom
hand/knob moves around(via last bit of lead
arm internal rotation) to get on plane(see
Nick's Bonds01 clip),for example.

5-launch-connection pulls knob via stable
lead arm/bottom hand so torquing is
uninterrupted through launch(no bat sliding/
hand stabbing)

This sequenec can for the most part be
"reverse engineered" from looking at hitters
that seem to have the quickest/most
successful rotational swings.