Roz Chast, known for her cartoons in The New Yorker, is interviewed by Steve Martin. After watching the video, read the comments on the drawn site. Some guy named Anus523 has a meltdown that is just a joy to read, especially when you look at the quality of his "art."
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.