Of course the man in the vid has been doing them for a long time, so he knows what works.
For the average lifter, it is best to start doing them very slow and controlled with a 5-10 pound DB and slowly work up from there, using sound judgement.
The problem i have with RC exercises, is when done incorrectly they can fuck up your RC worse than anything.
I quit doing RC exercises about 3 years ago, and my shoulders feel better than ever. as long as your shoulder girdle is strong from every direction, you shouldn't have any RC problems. if you have weak rear delts, do a lot of one arm DB rows with a hold at the top.
almost all RC issues are from over training. most physical therapists prefer to use bands for these movements.
The H-roll is a great addition to any program when done properly.
