There has been some confusion on what I was talking about with a 90* shoulder turn.
Some people think I mean rotating the shoulders a full 90* from where they start at address.
That is NOT what I am talking about. Most people are not flexible enough to do that and it falls into the category of what I am talking about when I criticize the “making a full turn” or “completing the backswing” cliches.
When I say 90* shoulder turn, I mean the angle the shoulders turn in relation to the spine at address. Perpendicular to the spine is another way to say it.
Here are a few videos and the others are on the “videos” link under “categories” and you will find several posts and videos on shoulder turn if you haven’t seen them before.