"Dada or Dadaism [French, from dada, child's word for a horse] Nihilistic movement in the arts that flourished chiefly in France, Switzerland, and Germany from about 1916 to about 1920 [and later -ed.] and that was based on the principles of deliberate irrationality, anarchy, and cynicism and the rejection of laws of beauty and social organization."
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.