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Elias KiptooMay 13, 2026Elias KiptooMay 10, 2026Elias KiptooMay 6, 2026
Topic
Zone 2
Aerobic base training, mitochondrial adaptation, and easy-pace work.
Elias KiptooThe Myth of the Fresh Threshold and the Science of Durability
Most runners step into a physiology lab, warm up for ten minutes, and run an incremental test to failure. They walk away with a precise lactate threshold and a shiny VO2 max number, which they then use to calculate th…
Elias KiptooWhy Cardiac Drift Tells the Truth About Your Base Fitness
We spend a lot of time obsessing over VO2 max and threshold pace when we are fresh. But those numbers mean very little at mile eighteen of a marathon. The true currency of a distance runner is durability, which exerci…
Elias KiptooThe Myth of the Fresh-Legs Threshold: Why Durability Matters More Than Your V02 Max
In a physiology lab, rested athletes put up beautiful numbers. We measure VO2 max, lactate threshold, and running economy on fresh legs, and those metrics look great on a clipboard. But mile twenty of a marathon does…
