I didn't run. My back was playing up. I was hunched uncomfortably for hours at work on Friday out on site. Didn't think too much about it other than having a bit of an ache between the shoulders. I thought about it this morning. Really stiff and aching - the back, the back was stiff and aching. Feels much better this evening so going to set the alarm clock and try take two tomorrow - ooh, nice, an alliteration. Managed a pretty rubbish bike session earlier but I was able sit with my back straight and I think that helped ease away the tension.