Who's had it? What caused it? How did you fix it, or manage it if that's the case? Any favourite exercises or stretches?

In my case, I think it's brought on by the contrast between slouching forward over a desk then surfing with the back arched and those slack muscles being worked reasonably hard. (Plus an old neck injury means my back might have to arch a bit more to make up for the lack of flex in the neck...) Hopefully I just need to stretch and exercise (and surf ) more - - and that's my plan. Getting older and the body won’t just automatically do what it always used to do.

I'm curious about how others have dealt with it and perhaps turned things around. Cheers, Wavey.