thanks..... i have just read this post ( missed it as did not see a notification) . Question: as i also agree that a lot comes down to trial and error . I have had back pain before... and it did go away, though I am always careful now, due to advancing age and stiffness.
Do you suggest stretching ? And , i just got a pull bar which i will hang from ( feet on ground) . It will take a while, i'm sure, as my shoulders and lats really need to strengthen up . When i was a kid i could do 20 chin ups, even one arm chinups. Now..... I probably could do one or two ( and really screw myself up ! )