The Dividing Line...

[Mike O]

DG wrote-: "Sorry guys that is incorrect....for a swinging stroke using 10-20-B, the golfer starts the downstroke by uncocking the right elbow through the muscles of the right forearm the pivot responds with a sliding action...then a rotational action during the release phase."

That's anatomically impossible. The right forearm muscles cannot straighten the bent/folded right elbow. That function is performed by the UPPER arm triceps muscle.

Forerarm muscles can only perform the following anatomical actions-:

1) Flex, extend, abduct or adduct the fingers and thumb.
2) Palmarflex or dorsiflex the wrist.
3) Radially deviate or ulnarly deviate the wrist.
4) Pronate or supinate the hand.

Forearm muscles cannot flex or extend the elbow joint because they are distal (peripheral) to the elbow joint.

If anybody contests my opinion, please be so kind to name the right forearm muscle which is "supposedly" capable of straightening the right elbow joint.

Jeff.

Here is one- although there are more:
Brachioradialis is a muscle of the forearm that acts to flex the forearm at the elbow. It is also capable of both pronation and supination, depending on the position of the forearm. It is attached to the distal styloid process of the radius by way of the brachioradialis tendon, and to the lateral supracondylar ridge of the humerus.