The hypotheses of the study are that children / youth with CP will by possibly use of technical aids be able to perform high intensity endurance training by walking / running on a treadmill, and that this training will improve their health by increased aerobic capacity and quality of life.

Inclusion Criteria:

• Person with CP, GMFCS-level I-IV, age 10-17 years
• Living in Mid-Norway
• Wants to increase his / her level of physical activity

Exclusion Criteria:

• Completes less than 75% of the total number of training sessions
• Not able to complete the testing and training procedures due to sickness, injury or other physical and psychological conditions