[hlnx1]

Distance performance comes down to three things:

• VO₂max: the size of the engine
• Threshold: how much of it you can sustain
• Running economy: how much oxygen you need at a given speed

Among runners with similar fitness, economy and threshold often make the difference, and strength plus plyometrics can improve economy. More: running economy, the third pillar.

Which one is your weak link?

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