VO₂ max gets all the attention. Running economy is why some runners with a modest VO₂ max beat runners with an exceptional one — and it's the performance variable most directly improved by OYF technique.
What is Running Economy?
Running economy (RE) is a measure of how much oxygen your body uses to run at a given pace. A runner with good running economy uses less oxygen — and therefore less energy — to run at the same speed as a runner with poor economy. Think of it like fuel efficiency in a car: two engines with the same power output can have very different miles-per-gallon figures depending on how efficiently they convert fuel to motion.
It is typically expressed as the volume of oxygen consumed per kilogram of bodyweight per kilometre (mL/kg/km). The lower the number, the better — a more economical runner uses less oxygen per kilometre.
~200
mL/kg/km — typical recreational runner
~170
mL/kg/km — trained club runner
~150
mL/kg/km — elite marathon runner
~8%
RE improvement possible with technique change
RE vs VO₂ Max — What's the Difference?
VO₂ max is your engine size — the maximum rate at which your body can consume oxygen. Running economy is how efficiently you use that engine. A runner can have a very large engine and still be slow if they waste most of its output through poor movement.
| Metric | What it measures | Trainability | OYF relevance |
|---|
| VO₂ Max | Maximum oxygen uptake capacity | Largely genetic, limited improvement | Indirect |
| Running Economy | Oxygen cost per km at a given pace | Highly trainable — technique is the biggest lever | Direct and significant |
| Lactate Threshold | Pace you can sustain before lactate accumulates | Trainable — tempo and interval work | Indirect |
"Two runners with identical VO₂ max values can have race times differing by 10–15 minutes in a half marathon, purely due to differences in running economy." — Research finding from Daniels & Daniels, 1992
What Determines Running Economy?
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Foot strike and landing position — Overstriding (landing in front of the hips) creates a braking force with every step that must be overcome. This wasted energy is the single biggest economy drain in most recreational runners. OYF's core lesson — land under your hips — directly eliminates it.
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Ground contact time — The longer your foot is in contact with the ground, the more energy is lost as heat and deformation rather than forward propulsion. Shorter ground contact time (driven by higher cadence) means more elastic energy return from the calf-Achilles spring system.
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Vertical oscillation — Energy spent bouncing up and down is energy not going forwards. A well-economised runner moves predominantly horizontally. Studies show that reducing vertical oscillation by 1–2 cm can improve economy by 3–5%.
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Leg stiffness and tendon elasticity — The calf-Achilles unit acts as a spring, storing energy on landing and releasing it on take-off. Stiffer tendons return energy more efficiently. This stiffness is developed through consistent minimalist running and foot strengthening — Heidi's programme in OYF is directly building this capacity.
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Muscle fibre composition and strength — A stronger runner wastes less energy stabilising the body during each stride. Core strength, glute activation, and hip stability all contribute to economy. This is why Keith Bateman's stride length increased by 0.45cm per step purely from accumulated strength — with no change in cadence or conscious effort.
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Footwear — Heavy shoes increase the metabolic cost of running measurably. Research suggests that every 100g added to a shoe increases oxygen cost by approximately 1%. Minimalist shoes also restore natural foot mechanics, allowing the calf-Achilles spring to function as designed.
How OYF Technique Improves Running Economy
The OYF system addresses running economy at every level simultaneously. Landing under the hips eliminates braking. Higher cadence reduces ground contact time. Minimalist footwear restores the calf-Achilles spring. Heidi's strengthening programme builds the foot and leg strength that makes all of it sustainable. Posture work reduces vertical oscillation.
This is why OYF runners often find their pace improves without any increase in training volume or cardiovascular fitness. They haven't grown a bigger engine — they've simply stopped wasting so much of the engine they already had. Running economy improvements of 5–8% have been documented with technique change alone, which translates to roughly 3–5 minutes over a half marathon.
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