Couldn't have said it better. I've incorporated this into my routine as my rear delt and scapula/upper back are a weak point for me after having shoulder and scapula surgeries. I've noticed improvements in rear delts and upper back significantly and I've only started these two months ago. Totally send my problem areas a wake up call. I use the 12-15 rep range as well. Going heavy/low rep with this just causes pain and cracking in my rotators and upper back. High rep/light weight really feels good solid burn and helps maintain form to really target these areas.