Exercise bikes are stationary bicycles designed for indoor cycling workouts. They provide a convenient way to improve cardiovascular fitness, build leg strength, and burn calories without the need for outdoor cycling. Many models come with adjustable resistance levels, allowing users to customize their workout intensity. These bikes often feature a comfortable seat and handlebars, making them suitable for various fitness levels. Some exercise bikes also include digital displays that track metrics like speed, distance, and calories burned, helping users monitor their progress and stay motivated during their workouts.