Posted by: tom.guerry () on Wed Feb 28 17:15:46 2007

> Hi Tom
>
> When I read your previous post, would I be safe in say the following?
>
> External rotation of the lead-arm rotates the wrist.
> Internal rotations, rotates the elbow – and or – raises and lowers the elbow.
>
> Jack

EXternal rotation of BACK arm is primary thing that starts "slotting" the back elbow which synchs with the flaring open of the front knee going into toe touch.

INternal rotation of a stretched/stretching LEAD arm "pronates" the lead wrist some.

Lifting/aBduction of the lead arm lifts the lead elbow.

The lead arm often lifts/abducts as it internally rotates, moreso for getting up for high ball.

Another important use of the terms comes in describing how the hands break with symmetric action in the overhand throw once you have gotten sideways to the target. Hodge describes and demonstartes these motions in the overhand throw part of his BIOMECHANICBASEBALL tape.

"break hands with abduction and internal rotation" , or

"break hands with elbows up and palms down" , or when there is more pronation of the forearms with handbreak,

"break hands with the elbows up and the thumbs down".

Back arm action that cocks or "tips" the bat prior to "prelaunch tht" (uncocking/untipping the bat) is similar to the back arm action when you break the hands for the overhand throw.