I get the impression that John Poindexter was watching Saturday Night Fever and thought, "You can tell by the way he walks that walk, he's a woman's man--no time to talk." and the rest just took care of itself.
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.