Over the years, I have heard that the versions of some of the games we get here in the US have been "watered down" from the originals. Something Awful has thoughtfully pointed out some of the games where the The Japanese Version Was Way Better.
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.