As a fan of advertising and having a sense of humor thoroughly formed by Mad magazine, Stan Freberg is like the God of Humor to me. His book, It Only Hurts When I Laugh, had me in stitches during the whole read.
I am amazed at the sheer number of Freberg related videos on the youtubes. Nice to know folks still appreciate him.
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.