hardish for 12k

It's friday today, so in other words, it's an unhappy tempo run day.
Warmed up for 3 km, then on a track 3 x 1.2 km repeats with 2 min rest between. During the repeats, try to run pretty hard, but even pace for each repeat. Maybe about 4/10/km to 4:15/km. That's 1:40 to 1:42 per lap of a 400-m track.

I did my best as below, it was pretty hard like I could die!
But I could run a bit of faster than I needed...

today's efforts:
mile: 12km
time: 1:04:03
lap1: 1:38 avg HR: 158-81% avg Pace: 4:16/km mil: 0.39km
lap2: 1:43 avg HR: 166-85% avg Pace: 4:21/km mil: 0.39km
lap3: 1:41 avg HR: 170-87% avg Pace: 4:19/km mil: 0.39km
2minutes rest
lap4: 1:40 avg HR: 156-80% avg Pace: 4:37/km mil: 0.38km
lap5: 1:44 avg HR: 171-88% avg Pace: 4:25/km mil: 0.39km
lap6: 1:40 avg HR: 175-90% avg Pace: 4:18/km mil: 0.38km
2minutes rest
lap7: 1:38 avg HR: 158-81% avg Pace: 4:31/km mil: 0.37km
lap8: 1:43 avg HR: 174-89% avg Pace: 4:46/km mil: 0.38km
lap9: 1:38 avg HR: 178-91% avg Pace: 4:20/km mil: 0.38km
2minutes rest

avg HR: 143-72% avg Pace: 5:36/km
cal: 456kcal
baginning time: 7:14am
location: on the track in Inokashira Park
weekly mil: 56km