Tunturi uses pre-set programs for training versatility. To make sure every user can effectively use the pre-set programs. There is only one way to make them flexible enough to take individual capabilities into account; the user must have the ability to set the duration and intensity. Tunturi T-Scale™ is a system that makes this easy. In Tunturi T-Scale™ users can scale the intensity by adjusting watts, speed, elevation or heart rate level. Scale the program intensity up or down to make it appropriate for your aerobic condition. With Tunturi T-Scale™ you can scale the intensity and duration at anytime and the program remains; so you always can get an effective and motivating training session.