It's not hard to find articles about the hazards of too much sitting. If you're stuck with a job that requires lots of it, that stinks. There are things you can do to mitigate it, but the best option is to do less of it.
If you do a lot of work on a computer, you might think sitting on a Swiss ball is a good ideal. Alas, not so much. A stand-up desk can be a great option, but they tend to be expensive. Fortunately, there are improvisational options. (Click on the images to see larger versions.)