Some people say Zone 2 is the best way to train for fitness and health. Others say women should avoid it altogether. In this episode, I dig into what the evidence actually says about Zone 2 cardio by breaking down a recent review paper on the topic.
You'll learn what Zone 2 actually is, where many of the claims about it come from, what the research says about fitness adaptations like mitochondrial function and fat metabolism, and the practical pros and cons of moderate- versus higher-intensity cardio.
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EPISODE RESOURCES
Watch on YouTube: Simplify Cardio: What Matters for Results
Read the review paper Much Ado About Zone 2
Listen to The Real Science of Sport podcast episode featuring one of the authors of Much Ado About Zone 2
TIMESTAMPS
00:00 Why Zone 2 has become so controversial
02:25 What Zone 2 actually is and why it's difficult to measure
04:20 Where the claims about mitochondrial function and fat burning come from
06:40 What the review paper found about Zone 2 versus higher intensities
08:00 Why Zone 2 is really moderate-intensity exercise
09:45 The CDC and WHO cardio recommendations
10:45 Does Zone 2 improve mitochondrial function and fat metabolism?
13:35 Why higher intensities often improve fitness more efficiently
14:15 The practical problems with trying to stay in Zone 2
15:50 The pros and cons of moderate versus vigorous cardio
18:55 Why the best cardio is the kind you'll actually do consistently