I Would Rather Be Walking!

I have discovered, after a week being back at work, that I am no longer used to sitting down for any amount of time. After a summer of activity, this sitting business is killing me! My lower back was so stiff all weekend that I came to the conclusion that something different must be done. So I switched chairs, and that seems to be helping. I have been trying to get up and walk as much as possible, strech it out, but that only goes so far. The fundamental problem is still there. I do not want to sit anymore!