you naturally speed up!! I was plodding on - at y 8:20 min/km pace, still a bit out of breath as I had been running only for a couple of minutes, when I heard steps behind me. Another runner, a very rare occasion at 10 am on a weekday. We said hello, and while he was overtaking he said "well done" and when he was probably 10 paces in front of me, "well done again, you're doing great!"
A quick peek at Garmin showed a 7 min pace... that's why I couldn't find the breath to thank him!!!
Whoever you are, mystery runner, thanks a lot for the kind words!