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“Zone 2” is the term the fitness world has (mostly) agreed upon to describe the low-intensity cardio most of us should be doing regularly. When you’re in zone 2, you’re working hard enough that you start breathing more heavily, but easy enough that you could hold a conversation while doing it. You stop a zone 2 session because your workout time is up, not because you’re too exhausted to continue. Zone 2 is defined in terms of heart rate, so what heart rate should you expect to see on your watch when you’re in zone 2? That’s where people disagree.
What is zone 2 training?
As I’ve explained before, the name “zone 2” comes from heart rate training. To train by heart rate, you use either a wristwatch with an optical heart rate sensor (that green light on the back) or a chest
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