"Well, look at it this way: if you want to make a baby cry, first you give it a lollipop. Then you take it away. If you never give it a lollipop to begin with, then you would have nothin' to cry about. That's like God, who gives us life and love and help just so that he can tear it all away and make us cry, so he can drink the sweet milk of our tears. You see, it's our tears, Stan, that give God his great power." - Chef
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.