Hi, I am unsure what I have done but I woke on Saturday morning with a really painful lower back. I get this sometimes when I stand for extended amounts of time. This time though it’s still painful now on Monday. I ran on Friday, a slow easy 6km and was at the gym on Thursday but I don’t recall doing anything that might irritate my back. Any tips how I might recover? If it’s still painful tomorrow I will be going to the doctor