This month's Official Playstation Magazine included a demo DVD that had heavy hitters like SOCOM II and Madden 2004. The game that was the most fun, however, was Disney's Extreme Skate Adventure. It is also available for the GameCube, GBA and XBox.
If you have ever played any of the Tony Hawk Pro Skater games, you will recognize the gameplay right away. The demo level of Andy's Room when playing as Buzz is excellent. Having to do a trick to get the Army Men released from a locked chest was a nice challenge.
The game is suitable for children and for us slower reflexed adults. I strongly recommend this as a quality holiday gift. Any of the above links will allow you to buy the game for only $29.99. That is 40% off the list price. A nice deal, if you ask me.
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.