I'm busy reading The Upside of Irrationality by Dan Ariely (and really enjoying it). In one of the chapters he reflects on work and meaning. Can human beings find satisfaction and be engaged in work that pays well, but offers no meaning? He unpacks two "types" of meaning: "m"eaning - a feeling of being challenged by whatever our work is, and completing it to our own satisfaction vs "M"eaning - a hope that someone else, potentially a significant someone, will find value [...]
Now how much more effective is this than a couple of posters on the wall and powerpoint presentations on improving your health by climbing the stairs ... Goes to show, when it comes to changing behaviour, we need to think outside the box!