Inclusion Criteria:  age 2 - 6 years at the start of the program a diagnosis of severe cerebral palsy or similar motor disability of non-progressive etiology (GMFCS level IV-V), being able to participate in group sessions having parents who want to take an active part in their child's training least one of the parents must speak fluent Norwegian or English.  Exclusion Criteria:  children with progressive disorders co-morbidity like autism spectrum disorder, severe visual and hearing impairments or intractable epilepsy that worsen with physical activity.