See Day of the Fight, Stanley Kubrick's first short film and other cinematic related items.
I just watched the film and it has some amazing shots (The hand/brother shot at around the 10:26 mark is really a good one.) After you watch it, you can learn more about boxer Walter Cartier and what became of 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.