I went out and ran for the first time in 6 years this morning. I’ve plotted the route I ran on the map below (map from eniro.se). I ran down to the marina and back in one hour. That’s pretty much exactly 6 km (3.7 miles).
Well, I didn’t exactly run the whole time. I probably walked 60-70% of the distance.

All things considered, that went pretty well. I felt no pain – but I did sweat like a pig. I’m not in terrible shape – but saying that I’m in great shape would not be true either.
Observation: I’m in-between terrible and great.