Incoming Signals recently linked to a post of mine and I am amazed at all the great links there. And, to top it off, there was a link concerning Richard Stark, one of the best hard crime authors out there.
I have found it helpful to do the stretching exercises my physical therapist recommends. Do some core strengthening exercises, such as the ones highlighted at The Mayo Clinic. By keeping your core strong, your back won't put itself in a position to cause that sciatica pain you are having.