What is the most important health metric to track for longevity?

VO2 max (cardiorespiratory fitness) has the strongest correlation with longevity. It improves with regular aerobic exercise. The Apple Watch estimates VO2 max from outdoor walks, runs, and hikes.

Can wearables really help you live longer?

Wearables that motivate increased physical activity can meaningfully impact health. Studies show people who use fitness trackers increase their daily steps by 1,000-2,000 on average, which correlates with reduced mortality risk.

Best Tech for Healthy Aging and Longevity