Lie on your side with your affected side facing upwards.
Lift your arm straight out in front of you so that it is parallel to the floor with the palm facing downwards.
Stretch as far forward as you can without rolling with your body.
Lift your arm upwards in an arc until it is pointing directly towards the ceiling.
Slowly return to the start position, remembering to stretch your arm forwards as much as you can throughout the whole exercise.
Relax and repeat.
Note a weight can be held in your hand to increase the difficulty of the exercise.