By measuring the “body’s ability to take in, circulate, and use oxygen” Cardio Fitness is a metric that gives a good indication of overall health and can also predict long-term health. While there’s a correlation between low Cardio Fitness levels and future health issues, you’ve got the power to raise your levels with consistent aerobic exercise
Interestingly, Cardio Fitness levels will show up even for outdoor walk/hike/run workouts that you’ve previously done. You can tap the timeframe icons at the top of Cardio Fitness to see daily, weekly, monthly, and yearly data (see more on this below).
Apple notes that cycling is another great aerobic exercise to improve Cardio Fitness, but for now, it doesn’t look like tracking Cycling workouts on Apple Watch will record Cardio Fitness data.
