They put to much stress on your elbows for no reason and also limit how hard you hit the actual rear delt head. When you get 48 as I am you'll understand that a slight change in how you perform these can prevent a ton of tendon pain. the guy above who said he does them cutler style, has the right idea. More bend in the elbow, and a higher lift performed by the actual rear delt head will get you bigger faster and with no consequences down the road.
Save your elbow tendons while you can!
Also...........while dumbells work, crossed over cables put more tension on throughout the entire movement and get you there faster as well.
Keep thinking that 20 years later........WATCH CUTLER!
there is zero stress on elbow...elbows arent fully locked arms are just hanging...you don't understand the movement.....I do them in crossover racks and went more bent arms too.....since I have been training over 25 years, and done these since my early 20's and my elbows have never had an issue (nor anyone i work with) - I repectfully disagree with you
My last post on this........they are your elbows, do as you please. In the following you tube video, the guy doing rear dealts is isolating them as much as humanly possible. ANY arm extension with a dumbell in your hand with your elbow straightened, DOES impact the elbow joint, it's a simple matter of physics and gravity acting on the weight, period. You say you have no stress, fine........but do that movement for 10-15-20 years, and then tell me about your elbow. How many pro's will tell you that behind the neck military presses completely wrecked their rotator cuffs? I can think of 7 off the top of my head. But while they were doing them for years on end they had no issues. Ask Dave Palumbo who can't even raise his arms over his head at age 41. Do you see that forearm support in my avatar? You'll be wearing two of them by then.
In closing in my FINAL post on the subject........I would like to ask the queston, when did SWINGING any weight, become a good idea? In that movement you are only hitting the delt at the upper 3rd of the movement. The rest is a complete waste of time, energy, and common sense.
To each their own........go forth and tear tendons!
Proper rear dealt technique:
YouTube - Rear Delt L Raises
More good form:
YouTube - 70 lb seated bent over rear delt raises for 13 reps at 19 (bdw 170)
More good info:
YouTube - IFBB Pro Chris Cook teaches rear deltoid technique from GMV
I get that.........You obviously DO NOT GET THAT IT STILL IMPACTS THEM. KIDS!