Heritage is rare when it comes to fitness equipment. Introduced in 1977, the Schwinn Airdyne ® has been and continues to be an industry favorite. The Schwinn Airdyne Evolution Comp Exercise Bikes are simply smart. The wind resistance is exponential, so the harder an exerciser pedals, the higher the resistance becomes, naturally providing the right workout for a novice exerciser or an elite athlete. Because the fan creates resistance with air, the braking system for the Schwinn Airdyne Evolution Comp Exercise Bike withstands zero friction, eliminating maintenance associated with more complex systems.