Yeah IDK, I'm conscious of that possibility as well but don't know how valid/serious the warnings are. Also, I do yoga daily anyway and try to include back exercises in my regime. Whenever I have a pull-up bar available nearby, I also do pushups and hangs. So far so good. Although I think my posture was probably slightly better around the time when I was sleeping on the floor (yoga mat) instead of a bed. Might return to that some time soon...