Originally Posted by *MC*
I sit most of the day as well. Have you thought about investing in a more ergonomic chair (if you will be sitting a lot for months and years to come)?
It's helped me to the point where my back on hurts from sitting when I am sitting for long periods of time at home.
Depending on what sort of chair you're sitting in, try a sturdy style cushion placed in the lower back area; I used to have back ache from doing study at the computer until I struck on using a cushion to replicate the expensive chairs, worked a charm.