A curved treadmill is a type of treadmill without a motor. Instead of a flat surface, it has a curved belt that moves as you walk or run. It's like running outside but indoors. It's easier on your joints and offers a more natural feel. You control the speed and intensity, making it great for various workouts like walking, jogging, or sprinting. It's popular for both casual exercisers and serious athletes looking to improve their strength and stamina.