An exercise bike is a stationary fitness machine designed for indoor cycling. It simulates the experience of riding a bicycle while allowing users to pedal in a controlled environment. Exercise bikes come in various styles, including upright and recumbent, catering to different fitness levels and preferences. They often feature adjustable resistance levels, allowing users to customize their workout intensity. These bikes are popular for cardiovascular workouts, helping to improve heart health and burn calories. Many models include built-in displays that track metrics such as speed, distance, and calories burned. Overall, an exercise bike is a convenient option for those looking to stay active indoors.