"Since 1977, Mike Carmichael has been painting, what started out as, a baseball. Sometimes, he's painted the ball 8 - 10 times a day. Today, the ball of paint is over 103" in circumference, weighs over 900 lbs. and is 32 inches in diameter."
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.