What you're doing, right now, at this very moment, is killing you. More than cars or the Internet or even that little mobile device we keep talking about, the technology you're using the most almost every day, is this, your tush. Nowadays people are sitting 9.3 hours a day, which is more than we're sleeping, at 7.7 hours. Sitting is so incredibly prevalent, we don't even question how much we're doing it, and because everyone else is doing it, it doesn't even occur to us that it's not OK. In that way, sitting has become the smoking of our generation. Of course there's health consequences to this, scary ones, besides the waist. Things like breast cancer and colon cancer are directly tied to our lack of physical activity. Ten per cent in fact, on both of those. Six per cent for heart disease, seven per cent for type 2 diabetes, which is what my father died of. Now, any of those stats should convince each of us to get off our duff more, but if you're anything like me, it won't. What did get me moving was a social interaction. Someone invited me to a meeting, but couldn't manage to fit me in to a regular sort of conference room meeting, and said, 'l have to walk my dogs tomorrow. Could you come then?' It seemed kind of odd to do, and actually, that first meeting, I remember thinking, 'l have to be the one to ask the next question,' because I knew I was going to huff and puff during this conversation.