I agree that there are better interval workouts for the marathon, along with doing strides after a slow run to make sure your form is not deteriorating. But looking at the number of "runners" who are taking 5 hours or more to complete a marathon, it seems any change of routine would be of some benefit to them. As well as the need to set out at a sustainable pace.
For a fall marathon, trying to decide on a realistic pace based on a half marathon time is problematic for me—what do you conclude from running 13.1 miles on a hot, humid, hilly course when your marathon will be flat and cool? Comparing Yassos from two years ago, I saw enough improvement to go out at a slightly faster pace, which held up pretty well.
Interesting discussion, I appreciate everyone's opinion.
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