I recently had a rather long debate about this exercise with a few lecturers and physiologists at my university on whether to exclude this particular exercise from being a part of the exercise prescription course paper for degree students. After much discussion, they found that the exercise was more helpful than detrimental; which I disagree with.
I raised the issue that the movement of the exercise at the peak of the movement reflects that of the test used to test for inpingement of the scapulae, yet this argument was countered with the comment of simply not raising the upper arm directly to parallel with the torso.
I realised this exercise has been discussed before, but im really looking to put forward a cohesive argument that this exercise should just be dropped from the learning program or altered in such a way that is safe.
What are your thoughts on this?