Lactate isn't bad. It isn't waste. It's fuel, and you can clear it and use it if you train for it properly. But you can't train what you haven't measured, and I was guessing.
So I got tested. After 40 minutes of running, my lactate at a 7:00 pace was 1.5 millimoles. Then we worked down in 15-minute stages, all the way to a 5:25 pace, where it hit 4.0. That's the territory where most runners hit their threshold.
Threshold pace, two ways. The lab test drew blood at 1.5 mmol/L at 7:00 pace and 4.0 mmol/L at 5:25. Every training zone I had built sat on top of a number that was 34 seconds per mile too slow.
My threshold on this watch is 5:59. My true threshold is 5:25. That's 34 seconds per mile of fitness the wrist estimate was leaving on the table.
And every zone I train in was stacked on top of that guess. Every easy day sat on it. Every threshold session sat on it. Every week I thought I was training precisely, I was training off a number nobody ever actually measured.
That's the part that got me.
A lactate test costs one to two hundred dollars. If you're serious about training by zones, it's well worth it. Testing isn't something I push on everyone. But I stopped treating the watch number as gospel, and I'm not going back.
This is what data-driven actually means. It isn't more gadgets. It's better ground truth. I've done fifty miles at 7:25 pace, and that sounds fine on paper, but the pace was never the story. The engine gets built on volume and fueling. The data just tells you the truth about where the engine is.
And that brings me back to where this started. Lactate isn't bad. It isn't waste. It's fuel. But more than that, it's feedback. Volume, fueling, and honest numbers build the engine. The test just showed me where mine actually sits.
More from me: inside the lactate test.
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Train like it's programmed. Because it is.
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