David, thanks for the links.  The even though I got a standing desk, I have 30 years of sitting to undo.  I’m much better than I was.  The straw that broke the camel’s back was spending 4 days on the floor due to a back problem.  Did all the testing neurosurgeon looked at my MRI and said I had SI joint inflammation, plus possibly some psoas involvement.   Said my “back” was generally good, asked what caused it he replied too much sitting.  Been working on it ever since.