Wearable devices track health and fitness metrics through embedded sensors that monitor various physiological parameters. These devices can measure heart rate, steps taken, calories burned, and sleep quality, among other metrics. They often connect to smartphone apps, allowing users to view their data, set fitness goals, and receive personalized insights. Advanced wearables may incorporate features like GPS tracking and heart rate variability analysis. By providing real-time feedback and promoting accountability, wearable devices empower users to make informed health decisions, encouraging a proactive approach to fitness and well-being.