From Jonathan Gault's 2023 NYC Women's preview:
JGault wrote:
Ritzenhein has been amazed at some of the sessions Obiri has put together. Three weeks before the race, she ran the same session she did three weeks before Boston, averaging 5:29/mile for 25 miles at elevation in Boulder. She also ran a 25k fartlek, alternating 1k a little faster than race pace and 1k a little slower than race pace, and came through the half marathon in 67:50.
Obiri has also been doing more longer sessions. Last year, Obiri's longest run before New York was 38k, with a couple more at 35k. This year, she's done five 40k long runs and five more of 35k. As part of that, Obiri has also started training on the fabled Magnolia Road. Ritzenhein marveled at one run in particular: 21 miles on Mags, descending from 8,800 feet to 8,200 feet before climbing back up to 8,800 feet, at 5:48/mile. When Obiri's On Athletics Club teammate Joe Klecker heard about that session, he had a hard time believing it.
"I think I ran 17 miles [on Mags] one time shortly before I won the NCAA championships, at about that pace," Ritzenhein said. "She ran 21."