Sometimes when I spend a lot of time sitting in front of the computer it gives me back pain, in my old job it happened to me What I did while working in the office, I got up from my chair and went to look for water or a coffee, I walked down the hall.
Or I went to the cubicle of some of my co-workers to talk a few minutes, this was done to not stay a long time sitting in the same position and I will end up hurting from the back.
Since it really was an uncomfortable situation and when I happened to end up taking a pill and placing cream on my back.