10 minute warmup, 12x400m (90s rest), 10 minute cooldown

Intervals
1: 7:48/mi
2: 7:54/mi
3: 7:57/mi
4: 8:21/mi
5: 9:00/mi
6: 8:15/mi
7: 8:29/mi
8: 8:48/mi
9: 10:35/mi
10: 8:32/mi
11: 9:45/mi
12: 9:11/mi
Obviously I got worn down pretty badly towards the end. Part of my problem was I ran over the freeway, I probably should have stayed on the one side, avoided traffic & the overpasses, and backtracked. Still, they did their job and alternated high/low heart rates.
I did this workout last year in preparation for the last marathon, didn't go over the freeway, and stayed below 8 minutes per mile. I forget if I'll be doing this workout again before December, but if I do, I'll stick to the one side.
6.11 miles, 1:04:11, 10:30/mi, 846 calories burned.