"Former Assembly Speaker Herb Wesson, D-Culver City, kicks Zhang Xiao Ju between the legs during a demonstration performed by Buddhist monks at the Capitol in Sacramento, Calif., Monday, March 22, 2004. In their first visit to the United States, a group of Shaolin martial artists from SongShan, China demonstrated acrobatic flips and shows of strength among other things. With the monks urging him on, Wesson made several kicks to the monk who showed no emotion. (AP Photo/Rich Pedroncelli)"
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.