Here is another biomechanical hack to help you deal with shoulder dysfunction. Most forms of stiffness or “flaccidness” come back to the body not dealing with a directional compression very well. By relation to its relationship to the upper traps, the deltoids are very relevant when it comes to dealing with lateral shoulder compression. At some point the fascia near the delts does have to be released for the purpose of creating a lateral decompression. If this all sounds very confusing, you can follow the technique on the video. Understanding the science is important, but experiencing the science is of higher priority.
Train intentional, not habitual,