I got some very useful guidance from Tinman a couple of years ago and set my masters PR of 1:31:03 (6:57 pace) at St. Jude. He suggested progressive tempo runs of 2 x 3 mile and 3 x 2 mile. I did that, plus some longer tempo runs (5-6 miles) and fast-finish LR's (15-16 with the last mile or two at goal HM pace or a little faster). Here's a report on my training:
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My goal half marathon is 13 days away. I finished off the hardest week of the training cycle with a solid workout: 12 miles (instead of the 15-18 mile LR I've been doing), with 6 x mile at goal HM pace, on short grass. 1:30 jogs between miles. Below are my times and average HRs (as % of max HR) during each mile:
6:55 (85.5%)
6:56 (86.5%)
6:53 (86.5%)
6:54 (88%)
6:53 (88.5%)
6:42 (89%)
I'm shooting for a goal pace of 6:57 or better. (6:58 is my Master's PR pace, set a few years ago)
At the end of the second mile my legs were a little tired, but they stabilized. The third mile was strong. And the final mile, more than 10 seconds faster than Mile 5, felt good. This was a tough workout, but not a real ball-buster.
The most significant thing about this workout is that it came at the end of a week in which I'd emphasized specific endurance paces (plus/minus a few % of goal HM pace) more than in ANY previous training week of my entire career. Wednesday was 3 x 2 miles progressive tempo (7:08/6:55, for example); Friday was 5 @ 7:08 continuous. Today was 6 x mile @ 6:52 average. That adds up to 17 miles of training in the vicinity of HM pace, out of 43 total miles: 40% of my mileage this week! The fact that I could hit my 17th such mile as hard as I did, without coming near my redline, seems like a good sign. My mpw. dropped slighly from my recent average of 50 mpw.
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So I did a whole lot of running, two weeks out, in and around my goal HM pace, but I did it as intervals, not as a continuous run. I grooved the pace, but I didn't try to run the race before I actually threw down on the race course.
I also did an 18-miler about three weeks out. Just a solid run, not a fast finish.
I ran a very strong race, for me, with a slight negative split. Actually, I think I ran 7:00 for the first 7 miles and 6:52 pace for the last 6.1. Tinman advised me to wear a HR monitor and run slightly below threshold for the first 3 miles, then gently begin to push. When things began to hurt in the final three miles, I was ready and able to keep on cranking.