I sat next to the San Francisco Twins at dinner tonight. They are a fixture here in SF, so I am sure they go unnoticed, but to a tourist like me it was a hoot. I didn't know if I should acknowledge them or not, but they were quite polite and gave me their "I am 8 minutes older/younger" speech unprompted. It was a most enjoyable experience.
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.