Fitness devices are tools designed to help individuals monitor and improve their physical health. These devices can track various metrics such as heart rate, steps taken, calories burned, and sleep patterns. Common examples include fitness trackers, smartwatches, and heart rate monitors. They often connect to smartphones or computers, allowing users to analyze their data over time. Many fitness devices also offer features like workout guidance, goal setting, and reminders to stay active. Some are waterproof and can be used while swimming, while others may include GPS for tracking outdoor activities. Overall, these devices aim to motivate users to lead healthier lifestyles.