L.A.
I have had back problems off and on, and can attest to how grumpy it can make you!! Physical therapy has been a lifesaver for me, but maybe it is the fact that it is coming from you (his spouse)? It is always hardest to take direction from those closest to us (that is why I do not give my kids swimming lessons even though I taught many years ago!). Is there a friend or co-worker who could help him with the therapy? It is probably best to hear from a third party. Otherwise, you will end up sounding like a nag (I know, having been there myself!)