I have been having lots of problems lately with Ann Coulter. When I see her on the teevee, I keep having to restrain myself from throwing heavy objects at the screen. I found a great link over at skippy's that covers the mistakes in Slander, her new book.
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.