Squat Universitywhat it claims
To eliminate discomfort in the back of the shoulder during a passive hang, it is advisable to relax the pectoralis minor for one minute using a massage ball, then activate the lower trapezius with a targeted resistance exercise to help the scapula orient correctly toward the back.
The idea of targeting the lower trapezius and the pectoralis minor to optimize scapular movement is based on sound biomechanical principles.
