Running 17:35 [5] 4.87 km (3:37 / km)
4x1217m intervals in 4:20, 4;22, 4:25 and 4:28. Not pushing quite as hard as sometimes since I'll be racing this weekend. I wonder how much of the progressive increase in times is due to the heat getting to me more over time as the workour progresses and how much is due to running up against cardiovascular limits and/or muscular fatigue. Memory claims the trend is less consistent in colder weather but a more rigorous comparison to support such a claim would be in order.