The S1 features a substantial 14kg flywheel, providing the rider with a much smoother ride compared to standard exercise bikes. 32 levels of electronically controlled resistance also provide that extra challenge. The new & innovative self-powered generator system means that you can take your workout anywhere without the need to worry about a power source. Your motion powers such features as the hand pulse sensor & the versatile computer display which shows a wide range of functions including speed, time, distance or your calories burnt. Staying true to spinning, you are also able to set a personal target time, distance, heart rate or calories burnt to stay on top of your workout.