What are they having him do for this posture fixing thing? That is pretty important, it could be a few weeks of in futility if they aren't having him do the right things. On the other hand like Steven said "it depends" you should still be able to get him a training effect despite limiting what he is doing right now.
"And for crying out loud. Don't go into the pain cave. I can't stress this enough. Your Totem Animal won't be in there to help you. You'll be on your own. The Pain Cave is for cowards.
Pain is your companion, don't go hide from it."