The Shoulder

The stretching is given with a reasonable amount of force, provoking some discomfort at the time.

What is felt after the procedure provides paramount information about the required intensity.

If there is no increased pain after the procedure, the stretch power has been insufficient and there will be no result. Hence, power must be increased at the next session.
Too much force will result in increase in irritation and pain for a longer period (more than two hours).
On the next occasion power should be slightly adapted.
So the amount of force applied must be such that there is some afterpain for the first few hours after the procedure.
It is therefore wise to stretch the shoulder out gently during the first occasion and gradually increase the amount of pressure during the next sessions.