The Airdyne Evolution features a smooth, air-based resistance braking system along with a pair of sturdy exercise arms. The advantage of the unique air resistance system is that it offers as much resistance as you can handle. (Also have all kinds of other Bikes ) The Airdyne Evolution's dual-action arms help you work out your entire body. Smaller, quieter patented evolution fan wheel provides controlled airflow and a low step-over height for easy mounting and dismounting. Second stage belt drive for a smoother and quieter ride. The harder you pedal, the greater the resistance. The dual-action design, meanwhile, synchronizes your arm and leg movements to simulate your natural motion, helping you work your upper and lower body at the same time. Finally, the air resistance system creates streams of cooling air while you pedal, making for a comfortable home workout. The Airdyne Evolution includes a comprehensive computer console that provides feedback on time, distance, workload level, calories burned, calories per hour, heart rate, and RPM. As a result, it's easy to keep track of your overall fitness level. Other features include an extra-quiet chain drive system; built-in heart rate monitoring; an LCD display; an anatomically correct seat with extra padding; and a capacity of 300 pounds. The Airdyne Evolution measures 50 x 22.5 x 48 inches