I'm having a go at this trainerroad cycling thing, during this week.
It's not the same as pootling around the neighbourhood, but an interesting experience nonetheless.
I think around 1,000 people started; there's around 330 left by now. My own charts of progress are below.
By this point, I can feel my legs hinting that they'd like a day's rest, as well as an unexpected occasional urge to take a few extra deep breaths.
The little spiky charts tell me that I have a couple of days of further effort ahead.