Inclusion Criteria:  Diagnosis of CP. Adolescents between 12 and 18 years of age. Gross Motor Functional Classification System (GMFCS): I-III. Cognitive abilities must include: Ability to actively engage in a training session of 60 min. duration; Ability to verbally or non-verbally communicate pain or discomfort; Ability to attend training, testing and follow-up sessions. All included participants are capable of making decisions on their own and no not show any signs of mental or cognitive limitations.  Exclusion Criteria:  Any surgery or botulinum toxin treatment within 6 months prior to the start of the study or surgery/serial casting / botulinum toxin injection scheduled during the study period. Other medications can be continued as prescribed by the participants' physician. Known cardiovascular or pulmonary diseases that have not received medical clearance to participate in the physical exercise intervention. Uncontrolled seizures or epilepsy