Running intervals 47:57 [4] 9.97 km (4:49 / km) shoes: Brooks Adrenaline GTS 9
Warm up plus 10 min @ 4:20, 2 x 1km @ 4:10, 10 min @ 4:20, warm down. 60 sec walk rest in between each.
Weirdly the first one was the hardest. Average speeds were 4:20, 4:04, 4:01 and 4:17. It was easier to run the 1km efforts faster than the 10 minute efforts.