I did it again:
Of my three attempts to do this (2020, 2021, and 2022), this was 3rd best. Considering that last year I didn't even make it out of Evanston, it wasn't really that bad:
So even though yesterday's marathon time was 21 minutes longer than 2020 and 25 minutes longer than 2021, at least I finished. But why so slow (other than I'm getting older)?
Some clues: in 2020 and 2021, I got about 8¼ hours of sleep the night before; yesterday I woke up after only 7¼ hours of sleep. In 2020 and 2021, I started the day with Garmin Body Battery scores of 93 and 84 respectively; in 2022, it was 49, and yesterday, 67. More relevantly, as my walking partner (who does Ironman races and so never crested a heart rate of 125) pointed out, in 2020 and 2021 I actually trained for it.
Another trivium. I have a 3-year-old Garmin Venu 2, and my walking partner wore an newer Garmin Forerunner 265S and an older Forerunner 935. The 935 uses GPS only. The 265 has a dual-band chip that "intelligently" switches between GPS, Galileo, and GLONASS. My Venu 2 can use any of the three navigation satellite systems, but I had it set to GPS+GLONASS. We walked the same course at the same pace, and except for a few minutes when our watches were all paused, we were never more than 2 meters from each other, and we recorded total course times within a few seconds entirely attributable to imprecision in starting the timers.
Yet somehow, my Venu 2 logged 44.45 km (27.63 mi) for the entire walk, while hers got 43.80 km (27.22 mi) and 43.73 km (27.18 mi) respectively. There is no possibility that I walked 725 meters—almost four Chicago city blocks—farther than she did. So later this weekend, we're going to dig into the track files to figure out where I got the extra half-mile.
Regardless, the weather was about the same this year as in 2020, meaning really gorgeous:
Yes, I'm going to do it again next September. But I'll also do a few other walks next summer to prepare. And my walking partner and I plan a hike on the North Branch Trail in Ocotober that ends not with a brewery but with pizza.