4min chapter

The Art of Manliness cover image

Get Fit, Not Fried — The Benefits of Zone 2 Cardio

The Art of Manliness

CHAPTER

Getting to Zone Two Cardio, You're Using Oxygen

When we're engaged in zone two cardio, so to speak, the oxygen requirements suddenly begin to spike. The body is already at that point in this kind of delicate dance where it's not really able to sustain this indefinitely. At zone three, what happens is you actually cross a point called the ventilatory threshold one. That basically means that CO2 levels in the blood are generating, they're utilizing energy at a faster rate than your standard aerobic systems can supply that.

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