Not sure what your trying to say regarding my shoulders. I guess the point I was trying to make re the 90' degree shoulder turn is just that I feel like I make a full turn back.
Dear jbrunk and mjh116,
Thanks for your responses, and my apologies for not being as clear as I always want to be.
Over the past several years searching for a better understanding of where the 'power' to accelerate the golf club comes from in the explosive down swing, I returned to Dr. Steve Nesbit's 2005 research papers and found 'work' being done by many many parts of the body. My favorite area to want to know more soon became the 'lead shoulder complex', but little did I realize how important the rear shoulder complex would become, with for me, required a very necessary and much better understanding of the anatomy involved.
I will not attempt to get into any details here but it is VERY important to at least have a basic 'picture' of what I call, 'golf's missing link(s)', the clavicles, their attachment to the scapulae and the resultant AND INDEPENDENT additional 'conical' range of motion of IMO, the most important golf joint, the humerus/glenoid from which the lead arm rotates, and again IMO, provides a significant percentage of the power needed to accelerate the golf club.
But what has this got to do with the trail shoulder, especially during the back swing ?? Sorry to take so long to get to the point of this thread, BUT THE INDEPENDENT CONICAL RANGES OF MOTION of both shoulder complexes become very instrumental in determining the degree of dynamic stability possible. mostly because of the possible wide variation in the positions of the shoulder complexes to the torso/rib cage (the core around which the lead and trail scapulae rotate, independently).
So what happens in the back swing, with the golfers goal to rotate the lead shoulder say 90 degrees, is that the trail shoulder, its clavicle and scapula have the natural tendency to NOT rotate relative to the rib cage, resulting in an INCOMPLETE upper body back swing, reduced range of motion, but worst of all kinematic sequencing/timing uncertainties and my favorite, dynamic balance and stability reduction due to the trail shoulder AND upper body too far in front , not on the shoulder plane etc. etc.
The good news is that this seemingly complicated area is as easy to fix as BBKIB, the "IT" in this case being a 'complete' rear shoulder back swing turn, and yes, WITHOUT STRAINING, try to 'keep it back (a little longer).
Sincerely,
Art