Predawn intervals:1000m repeats

Yesterday was a planned off day. This morning was up at 5:00 a.m. and out the door at 5:21 a.m. , warmed up 3k to the mirador, then hit the porta potty, and then stretched briefly and We I was off 4 x 1k with around 500s recovery, splits were 4:11,4:13,4:12,4:11. The splits were pretty even, but I was huffing and puffing more than I would have liked. In the last repeat I did not look at 200s splits, felt the slower and one as fast as the first one, I was feeling pretty tired in the last one, stopped for 1 min to catch my breath, then started my 3k cool down home. Around 11.5k total work. Have a great Tuesday!