Forget longevity buzzwords like Zone 2 and VO2 max, a top personal trainer says. Focus on this simple metric.0

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• August 22, 2026

What do the terms Zone 2 and VO2 max have in common? According to the celebrity personal trainer Harley Pasternak, they are irrelevant to the majority of people, the health-conscious among us included. If your goal is to be healthy physically and mentally, you are far better off focusing on a simple metric, such as