How about Tom Tomasello's extensor action drill? It does all 3 zones. It can be seen on the drills chapter of his videos in the gallery section.
Essentially, have them set up in a 3 point stance. Make a fist with the left arm and grab the left arm at the wrist with the right hand in a golf posture. Do a right forearm pickup to the top, then swing through to finish.
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