I appreciate the biomechanical reference to guitar playing. I have people who will appreciate the work.
The fact is that our bodies have a very specifically designed organization (a blueprint, if you will) that allows for enormous variations. However, when you repeat any specific posture often enough without returning to this original blueprint then the bodies adaptive capability will look for the path of least resistance and begin to 'move' itself into a posture that makes the 'newly requested' position more prevalent. This is the state that causes, or allows, for all misalignment. It follows that unless you continually remind the body of the original blueprint, a new one will be established through patterning. [The same thing we hope will happen in our golf swings] So no matter how much you safetly perfect your 'enjoyably life enhancing postures' (ie: golf and guitar, and frankly sitting at a computer and reading and loving and eating) your body begins to see the patterns of those postures as preferrable and adapts accomadatingly. Ok, so it is to the long term detriment but in the short run it makes sense to your physical components.
And there inlies the case for training in proper form with respect to your energy and your true long term goal of a pain free existence. With a regular training program, appropriate to your needs, the body will learn to give you the ability to use healthy protocols for your activities and then recover back to it's origin so that it can allow you to replicate joyful postures again and again; injury and pain free.
It sounds complicated but that's as simple as I know how to put it. Your body, like your finances, will grow and perform positively for you if you keep investing in the principal.
Your post was excellent. I didn't mean to imply that merely by learning better techniques would I solve my problems; in fact, much of the "Healthy Guitarist" is devoted to exercises and stretches for guitar players, much like Egoscue's work.
I've exercised at the gym 3-4 times per week all my life, so I realize the importance of fitness, but I will try to harvest past posts on this site to learn some new routines because I know I don't vary them enough.
The fact is, you have certainly created the most optimal opportunity to minimize the negative effects of your activity and that's what we all need to do; since the behaviors mimick so many other life experiences. I love that you get the Egosque material. He is a complicated man with enormous talent for understanding the human condition. If you ever have a chance, go to his studio in California. I have never had the luxury but know people who have worked with him personally. He is fascinating and knowledgeable and quite the character, from what I hear. Keep up the good work! Much of the work people transfer to 'professionals' can truly be discerned within oneself if you 'trust your own being'. That's a Vickism.