I am going to say it here and I will say it again and again until people know the truth...
Shoulders Down and Back is WEAK
Your humerus (upper arm bone) has a ball in it. Your scapula (shoulder blade) has a socket in it. If you put that ball into the socket and line up that socket so the load from the arm goes into the socket via the ball, then you will be in the most stable position.
If you point the socket down and the low is above the shoulder, then all you are doing is trying to win an arm wrestle from a poor position.
Don't believe me? Just try it!
Take a 5kg (10lbs) dumbbell. Don't think about it...just do a front raise and think about the weight and the effort it took to do that...maybe even film it. Now think about pulling your shoulder down and back and repeat the lift. Does it feel the same, heavier/harder or easier? 9 times out of 10, I am going to bet that it was harder with the shoulder down and back...that is because your body knows how to be efficient...it is only when you have a dysfunction do you have to retrain back to high function.
So next time, just point that socket at the load and you will be on your way to a more stable shoulder...remember to test it and go by your results 🙂