For those of us who are still scarred by John Cusack's recent romantic comedies (America's Sweethearts and Serendipity), this is a reminder of why we like him so much.
By choosing to go an independent route as opposed to pursuing industry blockbusters John played his ace card and presented himself as a real actor. Did it pay off? Hell, yeah! For instance, find me an actor that wouldn't personally fellate the Incredible Hulk for a part in a Woody Allen movie. Well, in the mid nineties John landed parts in two such movies, "Shadows and Fog" and "Bullets Over Broadway" with nary a trace of Hulk-jizz on his chin.
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.