Guilherme wrote:
2 x 2400 @ 6:30 pace w/1200 jog - 85% effort;
20:17 5k race on a really curvy course on a bad day;
6 x 600 @ 6:10 pace w/ 200m jog - 90% effort;
13 mile long run @ 7:43 pace - 70% effort;
4 x 800 @ 6:25 pace w/400m jog - 80% effort.
I admit that I did a bit of trolling in my first post in this thread, however I'm what amounts to a 90 minute half marathoner. I've done 1:26:40, and I've done 1:33:04, and I was 35 for both.
That said, those do not seem to indicate sub 90 in my experience, especially if they are your best workouts.
For instance, for a sub 90, I really think the 4x800 should have been pretty easy. Running a straight 2 miles in ~13 should be relatively easy (and repeatable off of 2 min rest).
For the two races I mentioned above, my final workouts two weeks out were 5x1600 in 6:20, 3 min rest (a mega slow 400), and I did not exceed 90% MHR.
Tempo runs peaked at 8 miles @ ~7, with 2 mi w/u and 2 mi c/d.
I never did shorter workouts at the track (always 1600s, but starting at 2 and adding 1 per week to 5).
Finally, I would do "fast finish" long runs. Do 12 miles at normal pace long run pace, 7:40 or so, then for mile 13, drop a minute to 6:40, and mile 14, (try) to drop a minute to 5:40. I admit to never hitting 5:40 on mile 14, however I did manage 5:43 and 5:48. Those were the hardest, but they gave me confidence that when the going got tough, I should be able to speed up anyway.
Next time I train for a half, I will probably restructure training so that I do some shorter track work just for the sake of turnover, and on those fast finish runs, I think it's smarter to do something like 10 miles, then for the next for try to reduce by 20s or 30s each time instead of 60s.