Whilst setting the table for breakfast I got a terrible cramp in my mid-back. Such spasms aren't new to me but they have tended to be higher up and in fairness haven't occurred in ages. I blame being cold almost all of yesterday and sitting in a twisted position in a long (boring) meeting through lunchtime. Maybe a hard effort swim didn't help?
I was lucky to be able to get an appointment with the physio who looks after my back and felt much better after some work on it.