2012 -
These terms tend to be vague and inconsistently used and interpreted. The best way to keep them straight is in anatomical terms. See the forearm and wrist sections here in this case:
Joint Articulations and Movements
pronation is a forearm twisting action that turns a flat palm down.
If our arm is straight, internal rotation of the upper arm can do the same thing.
the sequence of back and front arm action is always the same pattern for the MLB swing.
so if you think "ideally" thet the palms are "flat"/up/down (in reality, the main requirment here is "palmup extension" -"supinated" in this case of the back arm/top hand, NOT pronated) this means the lead palm is pronated by the internal rotation of the upper arm and pronation of the lead forearm, and while it is pronated, the lead wrist uncocks or unhinges primarily by wrist ADduction.
in the actual sequence in the MLB swing, this uncocking of the lead wrist happens while the top hand wrist is will "cocked" (Williams described wanting the top hand wrist "unbroken" at contact. What he was describing here is a top hand wrist that remains "extended" (another term is "dorsiflexed) while the back arm extends at the elbow as the lead wrist uncocks/aDducts/"unhinges", then the back arm/top hand "palm-up" wrist can uncock/finish "breaking" by aDduction.
This gets back to the "push/pull" question. The baseball grip is to support a two handed action which is turning the handle throughout the forward swing. If you have to say one thing is dominant, I would agree with Williams that it is ultimately a top hand power "push" swing, but it is better to understand how the upper body turns the bat throughout the swing with pushes and pulls via two handed action.
See if you can use the correct anatomical terms to understand and keep this straight.
These terms tend to be vague and inconsistently used and interpreted. The best way to keep them straight is in anatomical terms. See the forearm and wrist sections here in this case:
Joint Articulations and Movements
pronation is a forearm twisting action that turns a flat palm down.
If our arm is straight, internal rotation of the upper arm can do the same thing.
the sequence of back and front arm action is always the same pattern for the MLB swing.
so if you think "ideally" thet the palms are "flat"/up/down (in reality, the main requirment here is "palmup extension" -"supinated" in this case of the back arm/top hand, NOT pronated) this means the lead palm is pronated by the internal rotation of the upper arm and pronation of the lead forearm, and while it is pronated, the lead wrist uncocks or unhinges primarily by wrist ADduction.
in the actual sequence in the MLB swing, this uncocking of the lead wrist happens while the top hand wrist is will "cocked" (Williams described wanting the top hand wrist "unbroken" at contact. What he was describing here is a top hand wrist that remains "extended" (another term is "dorsiflexed) while the back arm extends at the elbow as the lead wrist uncocks/aDducts/"unhinges", then the back arm/top hand "palm-up" wrist can uncock/finish "breaking" by aDduction.
This gets back to the "push/pull" question. The baseball grip is to support a two handed action which is turning the handle throughout the forward swing. If you have to say one thing is dominant, I would agree with Williams that it is ultimately a top hand power "push" swing, but it is better to understand how the upper body turns the bat throughout the swing with pushes and pulls via two handed action.
See if you can use the correct anatomical terms to understand and keep this straight.