Lactate is a byproduct of anaerobic metabolism. If you can't tolerate that lactate build up, which most of us can't at a high enough level, your exercise becomes limited. Now, what you want to do is increase the capacity of your mitochondria to develop ATP and produce ATP at the highest work capacity possible. To do that, you have to train right at that threshold. And if you're too far below that, if it's actually easy to have a discussion, then you're not training hard enough.

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