Makes no sense at all. This morning, I felt all right — as comfortable as I ever feel when I’m out running — and my breathing was no more constrained than ever, but today I came in at 10:31. I was imagining, on the basis of nothing very sensible, that a twenty-second variance over ten minutes would count as a dramatic margin of difference, but it’s actually only (obvs) two seconds difference for each minute, so I’ll forgo the exclamation points and tone of outrage.
On the other hand, I have to admit that yesterday I ran, twice, to catch a #5 bus at St Aldates, and was not uncomfortable doing so. Except the first time when the driver, when I was ten feet from the front bumper and gesturing emphatically, closed the doors and pulled away.