A treadmill is a fitness machine used for walking, jogging, or running indoors. It features a moving belt driven by a motor or manual system, allowing users to exercise at controlled speeds and incline levels. Treadmills are commonly used for cardiovascular workouts, weight management, and endurance training. They help improve heart health, stamina, and overall fitness, and are suitable for beginners as well as advanced athletes. Treadmills are widely used in gyms, homes, and rehabilitation centers.