Wearable fitness trackers are small devices that you can wear on your wrist, like a watch, to monitor your physical activity. They track various metrics such as steps taken, heart rate, and calories burned, helping you stay aware of your fitness goals. Many models also sync with your smartphone, allowing you to view your progress through an app. These devices often come with additional features, such as sleep tracking and reminders to move. Popular brands like Fitbit and Garmin offer a range of options, making it easy for anyone to find a tracker that suits their lifestyle and fitness needs.