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He was running low 2:40s for years but not doing a lot of mileage or hard workouts because of work and family, and then he focused and brought the old Stanford talent to what was still a light training regimen of eventually 65-70 mpw in his 40s. Very impressive because usually you don't see these kinds of breakthroughs at that age when you've been running marathons already for fifteen years, and this goes about 5-7 minutes beyond the shoes. If he could stand 100 mpw, he might go low to mid 2:20s still.