155‑mile weeks flagged

John Korir’s reported 155-mile training weeks have become a talking point before the 2026 Boston Marathon, putting his buildup at the center of race analysis. (youtube.com) LetsRun’s Boston preview video said Korir had pushed past 155 miles per week, and a separate LetsRun report from Boston quoted coach Ron Mann saying Korir was “at about 155 miles” at one stage and had raised his peak from roughly 250-260 kilometers to 270-280 kilometers per week. (youtube.com) (letsrun.com) That range translates to about 168-174 miles at the top end, which is well above the 100-plus-mile weeks commonly associated with professional marathon training. A 155-mile week averages more than 22 miles a day before workouts, long runs, and recovery sessions are separated out. (letsrun.com) Boston gives that number extra weight because Korir is not arriving as an untested outsider. World Athletics said he won Boston in 2:04:45 in 2025, then won the 2025 Valencia Marathon in a personal-best 2:02:24, giving him victories in his past three completed marathons. (worldathletics.org 1) (worldathletics.org 2) The mileage figure also offers a clue to how Korir and his camp may view Monday’s race. Boston’s point-to-point course, with its hills and tactical surges, often rewards athletes who can absorb repeated changes of pace late in the race rather than simply lock into one even rhythm. (worldathletics.org) (baa.org) Korir’s recent record is why the buildup is being parsed so closely. He won the 2024 Chicago Marathon in 2:02:44, then became the first man to join his brother Wesley Korir as a Boston champion when he took the 2025 race. (worldathletics.org) (espn.com) Publicly available training data has fed that scrutiny before. Running With Rock reported in 2025 that Korir’s Strava account offered an unusual window into the training of a major-marathon winner, including mileage totals that stood out even among elite runners. (runningwithrock.com) High mileage is not a guarantee on race day, and coaches differ on how much volume is useful before the risk of fatigue or injury rises. But Mann’s account and Korir’s recent results place him among the clearest examples of a modern elite marathoner still leaning hard on volume as a base. (letsrun.com) Boston’s men’s field still includes other major names, and race shape can change with weather, pacing, and moves over the Newton Hills. Even so, the reported 155-mile weeks have turned one training detail into a shorthand for how aggressively Korir prepared to defend his title. (worldathletics.org)