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

Top personal trainer Harley Pasternak argues that tracking advanced metrics like VO2 max and Zone 2 is overcomplicated for most people, suggesting they are generally only relevant to elite athletes. For general physical and mental health, Pasternak advises focusing on simpler measurements such as daily step count. Evidence suggests maintaining regular activity, such as doing 150 minutes of moderate or 75 minutes of vigorous physical activity weekly, is strongly associated with lower health risks.