They suggest that it is associated with upper and lower trapezius and rhomboid muscle
The pain of shoulder syndrome along the upper scapular border has been attributed to the overstretch and fatigue of the levator scapula and rhomboid muscles
that occur when denervation of the trapezius leads to loss of scapular support and stability.
strengthen the extensor muscles of the upper extremities, the latissimus dorsi, teres major and the rhomboid muscles
(the rowing muscles), and the extensor rotator cuff muscles (infraspinatus and teres minor) two to three times per week;
Breasts are mainly fatty tissue with no muscle, so the key to lifting them is to strengthen the pectoral muscles along the chest, the latissimus dorsi, teras major and rhomboid muscles
in the back, and the anterior and posterior deltoids around the shoulders.
To improve your posture, squeeze your shoulder blades together and then release them; repeating this action 10 times, three or four times a day, will help open up the pectoral muscles in your chest and strengthen the rhomboid muscles
in your upper back.