There are so few experts I can reliably look to for expertise beyond what I already bring to the table. Nick Tumminello is on such expert.
This post is perhaps most applicable to fitness professionals, but I want to put Nicks work out there.
There is no doubt that I have often bought into the general ideas behind the joint-by-joint approach to training; but over the years have learned it fails to answer many issues it claims to have jurisdiction over. It also seems to create dysfunctions where perhaps none was indicated. I don’t think this approach should be thrown out, but rather used carefully as one of many evaluation tools at our disposal.
http://nicktumminello.com/2014/01/the-joint-by-joint-approach-claims-vs-the-evidence/
“ Talent hits a target no one else can hit; Genius hits a target no one else can see. ” – Arthur Schopenhauer
Fitnessgroan's Blog 
I have say that I’m not surprised that many of the things we assume to be true have not been proven. But after reading the post, I’m not sure what is true. I was not sure what he meant by “exercise”. Does he mean anything society defines as exercise, such as walking, or does he mean free weights or some other specialized form? Then, he talks about how some people are more sensitive to back pain and the difference between those who have pain and those who don’t is mostly physiological. Is that for people with “healthy” backs or would that also include people with herniated disks, ruptured vertebra, and other mechanical issues?