Not that I watch MSNBC anymore, but when I did, I never liked her. Give me Christiane Amanpour for great reporting. Ashleigh, say "hi" to Arthur Kent when you get to whatever journalist hell is next for you.
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.