Date: Sept. 28, 2025 Participant: Jeffrey Cook #11142 Race: 2025 Boulderthon Marathon Distance: 26.2 miles Weather: Perfect running weather with temperatures in the 50's to 70's and nice cloud cover

Negative Split, Major Field Advancement, Strong Closing Miles 3:36:51 finish (8:16/mi) over 26.2. Hit 1:49:41 at mile 13, then closed in 1:47:10 for a 2:31 negative split. Advanced from 1327th at mile 1 to 199th at the finish, moving past ~1128 runners (field size: 2678). Notable speed-ups: mile 12 in 7:26, mile 15 in 7:34, mile 19 in 7:28, and mile 10 in 7:48. Final 7 miles averaged ~8:20/mi with a strong finish (8:04, 8:06). Coaching notes: Early pacing fluctuated (miles 1–4 at 11:04, 8:28, 8:15, 11:47). Aim to settle near 8:10–8:20/mi by mile 2 to reduce variability and preserve late-race strength. For next build, practice controlled starts (progression runs/descending intervals) and target 8:20/mi for miles 1–3, 8:10–8:20/mi through mile 20, then press to sub-8:10 in the closing 10K—mirroring your effective negative split.