I sit so much on workdays that I keep a pair of 5 lb dumbells under my desk, a firewalker band, regular resistance band and pair of dixie cups in my desk drawer. Once in awhile if I feel like I've been sitting too long I'll do a few exercises (with my office door locked of course!
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With the band, I like to do rear delt moves like Cathe does in Travel Fit like bow and arrow, band pull downs or chest openers/stretches like BJ did in Delta Fit with a towel.
Sometimes I'll do reverse bicep curls with the 5lb dumbells (I remember hearing Cathe say in STS that was a good one to do to prevent injury) or single arm rear delt flies. I'm always looking for ways to work my posterior delts.
If I'm feeling like the chair is starting to attach itself to my butt, I'll take out the dixie cups and do forward/side lunges or I'll crank out some firewalkers. Sometimes I'll do walking lunges with the 5 lb dumbells. If my heart rate starts to go up to much and I feel a little sweat come on I'll stop and say to myself "WHOA Tiger, slow down there...don't want to be stinky for the next patient!"