Not been able to run since last Monday. Should have gone out on Wednesday but we were at the theatre so I planned to go on Thursday but since then I've had a really bad back. I've had problems with a back spasm that I get every now and then and although the spasm has died down (thankfully!) I still have a really bad ache and what feels like lumps in my lower back. I know they will go in a day or so but I'm itching to get out. It's made me realise I really need to focus on building up my core muscles to hopefully stop this from happening so often.