A spin class is a group exercise session that focuses on indoor cycling. Participants ride stationary bikes while following an instructor who leads them through various workouts, often set to music. The intensity can vary, allowing individuals to adjust their resistance levels to match their fitness goals. These classes typically last between 30 to 60 minutes and include a warm-up, a series of cycling drills, and a cool-down period. Spin classes are popular for their ability to provide a high-intensity cardiovascular workout, improve endurance, and burn calories in a motivating group environment.