It is often possible that people will neglect the smaller bodily structure muscles just to develop the huge house muscles just like the pecs, triceps and biceps. But, by not addressing the complex parts of the muscles you have, there is a risk of developing pain in the shoulder by not possessing the control and stability of the shoulder and this might cause bad elements not only to your usual routine but to other activities furthermore.
These daily physical activities improve the medial rotator by putting on a band to a door handle. After which, let your elbows curl up to a certain degree and grasp the band, making sure there's some tension to the band. After which, have your elbow placed to 90 degrees turned inwards going against the resistance of the band across your body. This may help your shoulder or structure to be stretched.