These exercises are simple and the band is inexpensive. The external rotation load is great and it really activates the infraspinatus. This muscle is often weak in people with rotator cuff disease. Focus on activating the muscles in between your shoulder blades by squeezing them together. This helps to correct postural muscle imbalances that contribute to your sore shoulder. The hammer curl position with your palms facing each other helps to lessen load on the bicep tendon with also contributes to pain in the shoulder girdle. This exercise should not be painful. Try at least 20 repetitions, multiple times a day.