We don't all sit a lot. ;) Personally, I've become a huge fan of standing desks. I have a Biomorph desk with a hand-crank adjustment, and my boyfriend has the GeekDesk (motorized up/down...very cool.) We both LOVE our desks.

Added benefits: Fewer back problems, more energy, and much less motivation to surf HN. (We now tend to spend a lot of our spare time exercising or being outdoors due to having more energy and less pain.)

I cannot recommend a standing desk highly enough. Believe me when I say you will hate it for the first 2-3 days. Get through that (take breaks by sitting if you have to), and it will likely be one of the best investments you've ever made.