Set out yesterday to add a further loop to my coffee-shop run & take in a forest road I'd much enjoyed last year. I was inexplicably tired before starting, though, and contrary to my expectations I didn't feel better with distance. Maybe I shouldn't have taken the hilly route 10k in, but I reckoned that the effort would wake me up a bit: it didn't, and at ~35k in I jacked it in. I'd set out with quite a strong NE wind at my back, too, and the thought of adding more distance to fight it on the way back home helped with the decision.
Getting home was murder, and after a shower and a quick lunch I stretched out and slept for two hours. Still knackered this morning, and it's a beautiful windless day.
Older ≠ wiser.