Actually holding the arm out straight at shoulder height the horizontal hinge (HH) will have ZERO roll just like a swinging door. It is only on the angled golfing plane that we get the swivel/roll when using HH.
Correct - on the horizontal plane
on the angled plane, you must turn/roll to keep that left wrist vertical to the ground
the 'feel' of that, the horizontal hinge on the angled plane, is what I am showing in the drill
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