What Happens If You Don't Use the Lap Belt

He purposely slouches and unless he has a lap belt on he will slide as far down as he can go. He takes after his Mom I guess. Well I don't purposely slouch although I definitely have a subliminal slouching problem. I will start out sitting up straight (trying to make a point to my spine and body that I really do want to sit up straight) and then realize minutes later I'm slouching. At least I don't get stuck under my table...