You should perform a range of motion exercises. You can consult a occupational therapist and/or physical therapist who can help in selecting the specific exercises that will benefit you.Tissues of a tight shoulder do not like to be stretched suddenly, roughly, or with a lot of force. Thus the strategy is to apply a gentle stretch so that at most minimal soreness results. You should carry out this shoulder stretching sequence three times a day. As much as possible, these sessions should be performed after the shoulder has been relaxed by a hot shower, bath, or aerobic exercise.