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You’ll know you are doing vigorous activity when it feels challenging. Your breathing should be deep and rapid at 70 to 85 percent of your maximum heart rate. You should sweat and be unable to say more than a few words without pausing for breath. This is the hypoxic response, and it’s great for inducing just enough stress to activate your body’s defenses against aging without doing permanent harm.
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Lifespan: The Revolutionary Science of Why We Age—and Why We Don't Have To
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