Although the reasoning behind using low weights for rotator cuff exercises has been discussed in this post, I still feel that there is something I am uncertain about. I have heard people say about rotator cuff exercises that they are "not a muscle building exercise", for example in this video.
My questions is, lets say that you are doing the exercise with perfect form and not allowing the bigger muscles to take over (as expressed in the other fitness question linked to), should you not try to push yourself with the exercise (in order to build the muscle up)? Otherwise the muscle would surely stay at the same strength level? Or is the point only to warm it up? I have had issues with my rotator cuff and am still unsure how much to push with the exercises.