This article will guide you on how to compare your Cardio Fitness (VO2 max) trends with other wellness metrics. Overlaying data like your resting heart rate or daily steps can help you discover correlations and better understand your overall health.
From the Wellness tab, tap the Cardio Fitness card to open the detailed view.

Below the Overview graph, find the row of tappable metric buttons.

Tap on a metric to overlay its data on your Cardio Fitness graph. You can choose from:

Tap the selected metric button again to remove the overlay and return to the default Cardio Fitness view.
This article explains how to overlay various health metrics onto your Cardio Fitness graph. This feature provides a powerful visual tool for analyzing how factors like activity levels, step count, and resting heart rate correlate with your long-term cardiovascular fitness trends, offering deeper insights into your health.