Sub40 goal midlife crisis?

[Tallon]

Dear TheEd
thank you for asking this feedback. This evening i did 6x1k with T=4'00. Temperature was 29ºC
1km warmup
1k 4'09 start bpm: 125, average bpm: 147
60sec rest
1k 4'06 start bpm: 122, average bpm: 152
60sec rest
1k 4'04 start bpm: 131, average bpm: 158
60 sec rest
1k 4'02 start bpm: 133, average bpm: 165
60 sec rest
1k 4'09 start bpm: 140, average bpm: 170
60 sec rest
1k 4'06 start bpm: 145, average bpm: 171 (stabilizing around 182 during last km)
60 sec rest
5' cooldown

Kind regards,