Wearable fitness devices track health metrics by utilizing various sensors that monitor physiological parameters. These devices can measure heart rate, steps, caloric expenditure, and sleep patterns, providing users with real-time feedback on their fitness levels. Data from these devices is often synchronized with mobile applications, allowing users to analyze their health trends over time. This information empowers individuals to make informed decisions about their health and fitness regimens, promoting a more active and healthier lifestyle and enhancing overall well-being.