Waiting out a new injury

I've been in denial about this but ... I injured my lower back on the motorcycle trip I took on Monday. I think it's a disc/spine type injury rather than muscular. I don't think it's serious... the kind of like the pinching pain you feel in the neck for a few days when you sleep wrong, except it's in my lower back, and it hasn't improved a whole lot in 2+ days. I still think I can still exercise and it may even be good for it. I may try and run the stadium stairs later today after the rain or tomorrow. I definitely felt something in my back when I picked up my cycle after laying it down in the mud.