FALSE – Whilst it’s true that arthritis (also called wear and tear or joint degeneration) is irreversible, when you have it, it can also lead to problems such as muscular aches and pains which absolutely can be improved.
The worst case I ever saw was a lady who I had to go and see in her static home as she couldn’t really walk (it was actually her neck that was the most symptomatic (!)), and even she got some relief from treatment and the right exercises. Don’t give up!