I have discovered another good way to beat the Lord of Accounting (or Law or Paper Manufacturing or wherever you may be). Get away from your desk as much as possible! I do this by keeping things like the 2-hole punch we use for filing on the counter behind my desk so I have to get up every time I need to hole punch something for filing. It may sound exhausting or annoying, but it really helps keep that Office Fatigue (read: the squishy mind and heavy limbed-feelings that come from sitting in one place staring at a screen for 8 hours) at boy.
Plus, it might help keep us all from getting "Office Chair Butt-Syndrom" (read: flat, squishy bums).