I have back trouble as well, doing just the simplest of the things can cause it to "seize" up on me, usually muscle spasms as a result of a HS football injury, which can take from a couple days to a week or more to finally quit hurting. My back can get stiff or start to spasm if I drive for too long without stopping for a stretch break. yeah, I know where you're coming from, just bending over and something catches. I do some excercises 5 days/wk to help combat this, and has helped me alot. GL