Speedwork at the track.
3 x 1 mile repeats with 400 recoveries.
100% humidity, so even the coolish 19C/66F didn't feel great.
I was off my game to start, and ran the first 3 laps too slow (4 seconds/lap too slow). But I nailed the next 9 laps.
Mile splits were 6:54, 6:39 and 6:41
I woke up with a stiff right knee for some reason. Will have to keep on eye on it.