Not been running for a couple of weeks because of a virus, feeling shivery and sweaty, blocked sinuses and so on. I felt back to (what passes for) normal and went out on my run this morning but after about ten to fifteen minutes I wasn't feeling as sprightly as usual (which is not very sprightly) and had to walk. At this point I realised my legs had gone, I couldn't get my breath and was very much taken by surprise. These viruses are tricky articles, they lull you into a false sense of security and just when you think you're shot of them they come back and bite you in the bum.
So, I shall do what many of the folks on this forum do, who are far wiser and more experienced than me, go back to week 5 or 6 and gently bring myself back to the boil.