I swear every time I was running into a headwind, which is pretty hard when you do an out and back. I could be wrong but it felt like it.
Reps were 3:59, 3:56, 3:51, 3:50, 3:54. All done with a 2 min walk recovery.
They felt easier to run.
Did a 2k warmup and a 2k cool down after the session.