I wrote this about 5-6 years ago...its what i have alot of advanced guys do for their widowmaker....Ive had Dusty on it for a couple years now
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Shoulders:
You take a machine like the one below or similiar (pictured is the Cybex shoulder lateral) and you dont grab the regular handles that you see in the picture near the pads....you grab the metal bars as I outlined in red in the picture. (little bit lower than the red box i drew but you get the picture)--if you start grabbing that bar too hard you have to make adjustments and grab it thumbless instead.
Seated and facing the machine (obviously) (after 1-2 warmups) you take a weight that is insanely hard to do for 20-30 reps straight setted. You have to be true to yourself here and only count reps where your elbows get even with your shoulder height at the top of the rep....I do this by watching for a plate to come up into my point of view....usually when i see the 100 plate come up to where i can see it...I know i made it.
This is how it goes--right in a row
a) 20-30 reps straight setted--all the way up to parallel with shoulders and all the way down--and these should be brutal at the end of the set to where you might need to pause just for a second (a true second we arent rest pausing here) to gather your bearings to get 3 more...2 more...1 more on the journey after you get past the 15 rep mark or so
b)immediately you do 10 partial reps which will be from the absolute bottom (for you, everyone is a different width, so your bottom will be different than Dave Bair's or Trulyhuges bottom range) to about halfway up now....so 10 partials from bottom to 45 degrees. (These will hurt) ....and yes there is no "other"....its 10 partials or your a candy ass nancy boy.
c)immediately after that you do one static hold and there is no excuses here....YOU WILL GET 30 SECONDS AND YOU WILL MAKE IT. You go up about 5 inches from the bottom (right below where you did your 10 partials) and you hold it there and you get 30 seconds. I do this by sitting up straight, flexing my lats outward and spreading my shoulders and raising them up and holding. This is the part where you will be squirming on the seat and probably using my name with profanity...because this hurts...alot...not a little....alot...(did i say how painful this part is?)
So you do A, B, C right in a row
Thats written in stone.
Now what you do for me and yourself is.....3 way spit guys who have weak shoulders....every single time shoulders comes up in rotation, this is your second exercise (straight setted)...AND MORE IMPORTANTLY...EVERY SINGLE TIME YOU DO THIS YOU MUST/MUST/MUST/MUST/MUST further this ahead. You try like a son of a bitch to always keep it in the 20-30 rep range but the weight always goes up 5-10lbs next time when you get over 20 reps on A.
Over months and months and months of fighting up in weight in the 20-30 rep range you will start falling under that range and then you make the battle to the death 15 reps (every time you get 15 or above you go up 5-10lbs next time shoulders comes up).....and then sadly down the road youll start falling below 15 reps and the battle is to stay above 10 reps, anytime you hit 13,14,15 or more you add a 5lb plate for next time....and your fortitude takes over from then on....because once you fail at anything 10 reps or below this exercise is gone.....so fight.
(Doesnt matter because by then youll be almost doing the whole rack and your delts should look dramatically larger/rounder)
You should be on this exercise for 6 months if not a year fighting the uphill battle. Sometimes the choice will be to go for more reps with the same weight and that will be the right choice but most of the time its you working your way up that weight stack so keep that in mind.
Newbies who dont listen to me and start widowmaking every bodypart or adding these to your 2 way split repertoire get ready for short blasting phases and overtraining and me saying "I freaking told you so why you shouldnt be doing it on the 2 way split!" in the future
Sidenote:--im a 6 footer so i put the seat all the way down the bottom....but i guess everyone has to figure the seat adjustment out accordingly to your own height