Notes
Very hot, and the run felt a little harder than the pace an heart rate suggested. I just didn't feel like pushing up to the 149/150 level when running around the Picture Gallery. I think it was the right thing to hold back a bit because it was hard and hot enough at the slightly lower level.
Interesting. I just compared against the same run last week, which I called upper aerobic, and this time I ran about the same pace, but at several bpm lower heart rate. At first I didn't feel justified calling today upper aerobic.