Absolutely. I agree 100%.
But I am not, at the moment, talking about spinal arthritis. That's on my left side. On my right side however, I tore a ligament or muscle, DUE TO SOME UNFORTUNATE EXERCISE MOVE WITH A 12KG RUSSIAN KETTLEBELL. It is this injury that is not advised to aggravate, not my arthritis.
Yes you mentioned that a few times. I definitely would not work with that trainer anymore.