Road running race 48:37  10.0 km (4:52 / km)
shoes: Adrenaline 17 Gray
The Fall 2017 Goddard Space Flight Center 10k. This is a free, timed 10k, held twice a year on the mostly natural surface trail around Greenbelt Lake. The only catch is it's on a Wednesday at noon.
It's 4-2/3 laps around the lake, measured years ago by John Sissala, a certified USATTF course measurer (and NASA employee). Today was 70s and muggy, overcast, with rain in the forecast. No rain fell during the race, but it rained before and after.
I've run this course many times, and although the lap lengths are awkward, I've developed a method of pacing. Today I figured 8 minutes for the first 2/3 lap plus 4 9s would get me 44:00, and 9 plus 4 10s would get me 49:00. I wanted to be closer to the lower number, but it wasn't to be. Actual lap times: 8:15, 10:01, 10:06, 10:07, 10:01. Total 48:37. Much slower than I hoped for, but pretty good splits, indicating a steady pace.
I was totally dead afterwards. I went back to work, showered, ate lunch, sat down at my desk and thought about what to do next. The answer was, sleep or die. So I went home and obeyed.