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Guts interrupted both runs so clearly something amiss.
Research has shown
that your body doesn’t see a significant increase in aerobic
development, specifically mitochondrial development, when running over
90 minutes. The majority of physiological stimulus of long runs occurs
between the 60 and 90 minute mark. This means that after running for 3
hours, aerobic benefits (capillary building, mitochondrial development)
aren’t markedly better than when you run for only 2 hours."