I absolutely wrecked my half. My previous PR was 1:43:02. My new PR is 1:41:09.
This our town's local marathon / half-marathon. I've run the half a bunch of times and have the course completely memorized. Very good conditions for the 7:00 am start -- about 40 with light winds (8-10 mph depending on which forecasting site you believed). The HM course is pretty sheltered so that level of wind is negligible. It was also overcast the whole way, which was nice. I ended up running almost the entire course with half a dozen 20-somethings (three M, three F), some of whom knew each other. One guy pulled away from all of us around mile 10, and I pulled away from the rest about a mile later. Technically one was doing the full, so we lost her at the split between miles 10 and 11.
I came into this planning the beloved 5/5/5 approach, so I'll break out my splits that way.
Miles 1-5: 7:38, 7:38, 7:49, 7:33, 7:41. I went out "fast but comfortable." Several years ago I managed to break myself of the habit of starting too conservative and then finishing with a bunch of gas sloshing around in the tank. Covering 13.1 miles is a non-issue, like it's a non-factor for most of you guys, so I want to make sure I'm racing, not just running. Mile 3 was a little slow in part because it features a small amount of off-road running and a couple of choke points. You can see that I pushed a little on mile 4 to make up that time. Honestly, I knew somewhere between miles 3 and 4 that I was going to crush my PR.
Miles 6-10: 7:43, 7:38, 7:42, 7:43, 7:47. At the halfway mark, I was on pace for 1:40:30. I knew it was extremely unlikely that I would be able to maintain that pace, and I'm okay with a mild positive split. The slower splits here are a combination of me pushing up against my lactate threshold and a deliberate decision to back off very slightly. Mile 10 is an outlier, featuring a very steep hill. It's only 0.2 from bottom to top, but it's a tough incline and also hard to descend safely. Every year I willingly give up some time on this rather than attacking it and leaving myself depleted for the final stretch. In other words, that 7:47 is completely fine, normal, and acceptable for that particular mile.
Last 5K: 7:35 (dropping the hammer), 7:41 (picking the hammer back up), 7:41. Last 0.19 (Garmin): 7:20 pace. In my training leading up to this race, I had been doing my long tempo runs at about a 7:35 pace. I tried to pick up the pace during this last stretch, but it just wasn't there. If I can run 13.1 miles at this pace, obviously my "true" LT pace is probably a little faster than I thought it was, but there's no question that spending this long at or near my LT threshold was holding me back at this point. Not fading, but no real capacity to mount a surge either. I would have had to slow down if this had been a 15 mile race instead of a 13.1 mile race.
Official results: 1:41:09, 7:43 pace (7:40 Garmin pace)
26/355 overall
3/19 M 40-44. I actually got credit for 2nd in my AG because the first place guy was 3rd overall and 1st in Masters.
This particular result may end up being a lifetime best since I'm not getting any younger, but sub-1:40 is only 69 seconds away. Long endurance isn't the issue -- I'm pretty sure LT is my binding constraint at this distance now. Gotta give it a shot though, either this fall or next spring.
Mrs. K ran this morning as well. Her 1:51

x was good for 3rd in her AG. (She also benefited from faster runners not being able to double-dip in the AG results; she was really 5th but we always take AG awards however we can come by them).