Can someone link me to some evidence that couches are healthier than good desk chairs because that's probably one of the craziest things I've ever heard.
I've never had a couch that I could recline further in than my desk chair so Beamer's example is a bit strange. Unless I'm laying on the couch I've actually found sitting on couches to be a rather uncomfortable experience. Couch cushions are usually too big to be sat in properly unless you have a small couch, so you either end up with dangling feet or empty space/no support in the lumbar area which then causes lower back pain.
So is the whole lumbar support thing just a sham? We're better off sitting on couches which tend not to have lumbar support?