Disappointment galore - basic learning - don't go all out on the first track and then suffer.
Did first 1200 in 5:53, second in 6:18 and felt a pull in my left hamstring on second lap of third track.
My pace is probably around 2:03, so run the first one slowly while the legs are still warming up at about 2:10 pace.
Run the second set of 400s at 2:05 pace and the last one at 2:00.
That would be awesome and something desirable.