Today I opted for the indoor track because of the cold rain (about 6C with steady rainfall - ugh). I warmed up well (5 laps) then did 4x878m @ 85% effort (3 laps each). It went well! I did them in 5:04.7 (5:47.1 for 1km), 5:05.3 (5:47.8/km), 5:06.6 (5:49.3/km), and 5:09.5 (5:52.6/km), at a true 85% effort; comfortably hard. My hamstring did well, hurting 1/10 at most.
This week we'll do 2 speed sessions :) and that was a good start. Not fast, but hey, starting somewhere.