There are four rotator cuff muscles and their job is exactly what it sounds like: to rotate the humeral head and to cup it and support it. Think about where the head of the arm bone is, it is like a golf ball in your shoulder. You want to position it mid-socket like you are balancing a golf ball on a tee. The golf ball needs to be centered on the "tee" especially when you are weight bearing. In plank, try energetically dialing your hands out to help get the rotator cuff cinched into place.
I never cue people to shift forward in plank because it is structurally unsafe. What is more important is to decelerate with control and keep the humeral head in place. It will probably feel more challenging than shifting forward. It's harder to not lean because you have to use all the surrounding scapula stabilizers that are weak for so many people. Use your muscular stability instead of leaning into the structures of the shoulder that aren't going to have the sustainability of using muscles. Don't let the humeral head dive forward.
Feel freedom in all the surrounding tissues of the shoulders. The shoulders and how we hold them is our presentation to the world. Put this class into your cellular memory and wear it like a coat.
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