Head is an achin' and knees are abraded
Plates in my neck and stitches updated
Toes are a cracking and Tendons inflamed
These are a few of my favorite pains

But yes, the author of those books is mostly correct, there's some kinds of pain that serve as a useful warning function. Those are good and we should be grateful.

Others are artifacts of historical stupidity. I've learned those lessons and reminding me of them is useless.