Try to think of extensor action as a pull or a tug not a driving of the right arm, as if your left arm was a bungee cord and needs a pull on it.
Great, Mike. You're right on.
Ben Doyle, G.S.E.D., teaches many of his lessons in the near-perpetual 'sweater weather' of Carmel, California. When he demonstrates Extensor Action, he uses his right hand to tug downward the sweater sleeve of his Left Arm.
Now, that's a demonstration we can all understand!
Yoda,
Then why does the first sentence of 6-B-1-D say..."EXTENSOR ACTION is exclusively the steady effort to straighten the bent Right Arm"???
DG
[Bold by Yoda.]
Because that is what it is, DG: The steady effort to straighten the Bent Right Arm.
But, alas, the Left Arm Leash constrains the unruly Bent Right Arm, and hence, despite its best effort...
Until the Left Arm moves away from the Right Shoulder in the Downstroke...