Topic
Zone 2
Aerobic base training, mitochondrial adaptation, and easy-pace work.
Elias KiptooDo exercise snacks actually raise your VO2 max?
Forty-two inactive adults did three 30-second all-out stair climbs a day, three days a week for six weeks, about 27 minutes of total exercise, and lifted VO2peak by 7 percent.
Elias KiptooHow do I know if I'm actually in zone 2 without a lactate test?
A 2025 lab study of 165 recreational runners found that at 80 percent of max heart rate, the usual top of zone 2, 43 percent had already crossed their first lactate threshold.
Elias KiptooDoes Double Threshold Training Actually Make You Faster Than One Hard Day?
The Norwegian distance runners spent the last few years turning the training world upside down, and the centerpiece is a method called double threshold: two sub-threshold workouts in a single day, morning and afternoo…
Elias KiptooDoes Running in the Heat Actually Boost Your VO2max Like Altitude Training?
Every summer a runner logs a brutal August tempo, sees the pace tank, and assumes the block is a wash. It isn't. What's happening under the hood during those miserable weeks is a genuine adaptation, and the research o…
Elias KiptooHow many strides per week does it take to boost your running economy?
Most runners obsess over their long run and treat strides—those short, relaxed 15-to-20-second accelerations—as an afterthought, if they do them at all. That is a mistake, and the mechanism is more interesting than "t…
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…
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