"Yes, yes. I thought I'd be seeing you soon. Harry Potter." It wasn't a question. "You have your mother's eyes. It seems only yesterday she was in here herself, buying her first wang. Ten and a quarter inches long, swishy, made of willow. Nice wang for charm work."
"Your father, on the other hand, favored a mahogany wang. Eleven inches."
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.