I quoted the text from the ddj site, but I added the links. I was a big fan of HI Q as a kid and I played the other games, just under different names. I had no idea that there was so much intellectual mumbo jumbo behind some pegs and some dots.
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.