Clavicle lines parallel sloping down with lines

Ignore the red dots (they’re where this person wasn’t feeling so great).

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Overhead Shrugs vs Regular Shrugs

Data On Traps Part 1: Muscle Fiber Type & Function - N1 Training

List of anatomical lines - Wikipedia

Shoulder: Impingement Syndrome

For a Great Fit, Start with Fitting the Shoulder - Threads

Anatomy of the Clavicle and Its Articulations

Acromioclavicular Joint - Physiopedia

Sc13 sheila's sore shoulder