The shoulder is the most complicated joint in the human body and with the greatest range of movement. Shoulder problems can often be brought on as a protective strategy of the joint to restrict movement. Muscles, ligaments and tendons go in to protective contraction which is the primary cause of the pain and stiffness. One of the best physio treatments you can do for frozen shoulder is something called "pendulum rotation shoulder exercises", or “Codman’s pendulum exercise”. This involves leaning forward and supporting yourself on the good arm, with a weight in the other hand and, while trying to keep the shoulder loose, allow the weight to either swing or rotate. Change the direction now and then. I’ve cured shoulder problems on more than one occasion using this exercise. It works by stretching all the muscles, tendons and ligaments in relaxed position and releasing the joint from the contractions that are causing the pain.