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Elias KiptooMay 26, 2026Elias KiptooMay 10, 2026
Topic
Zone 2
Aerobic base training, mitochondrial adaptation, and easy-pace work.
Elias KiptooThe Difference Between Fitness and Durability
We see it every marathon season. A runner hits the wall at mile twenty, watches their pace collapse, and blames their fueling strategy. But often, the true culprit is a lack of durability. Recent sports science has fi…
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…
