VLamax is the maximum rate at which your muscles can produce lactate (mmol/L/s) — essentially your anaerobic horsepower ceiling. Sprint swimmers need ~1.0 mmol/L/s, middlers 0.5–0.7, marathoners 0.2–0.4. Unlike vague 'anaerobic capacity,' it's a number you can retest every 4–6 weeks via lactate testing and actually program toward.
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