When I see this stretch being prescribed to clients it makes want to throw a chair, especially when the structures have not been addressed first.
The muscles around the shoulder will tighten and tone up to protect itself, and if you stretch that out you're only going to make it worse. There is a hierarchy of structural importance that needs to be addressed first and they all affect the shoulder.
You need to restore thoracic mobility before you start stretching your shoulder. Something simple like a rib lift in side-lying can be a great fix for that.
Don't stretch a muscle unless you truly know it is short, tight and isn't being used to protect something else. If you want to better understand how to assess, treat and fix shoulders then take a look at my "Ultimate Shoulder Health Guide" (under the program section).
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