I don't know why - maybe because I'm a bit tired generally - but it's feeling like a real slog at the start of every run at the moment. I start out telling myself it's ok to go slowly, and I only have to do a very short run if that's what I can manage.
Then somehow if I get past the first 10 - 15 minutes it feels fine. And by the time I finish I'm suffering under the delusion I could run for another half hour if I needed to. Weird!
I religiously do some extra warm ups - then a 5 minute brisk walk - and I'm stretching afterwards.
I've asked my running buddy who I only get to run with about once a month - and she thinks it's age.