Spin classes are high-energy group workouts that focus on indoor cycling. Participants ride stationary bikes while following an instructor who leads them through various routines, including changes in speed and resistance. The classes often feature upbeat music to keep motivation high and can accommodate different fitness levels. These classes typically last 45 to 60 minutes and aim to improve cardiovascular fitness, build strength, and burn calories. Spin classes are popular in gyms and fitness studios, and they provide a supportive environment for individuals looking to enhance their workout experience while enjoying the camaraderie of fellow participants.