There is increasing evidence that physical activity during childhood and adolescence has an important impact on health and behavior outcomes. Lack of physical activity is currently a major concern for the total population and especially for children and adolescents. People with disabilities are at risk for the same health problems as the general population. Due to their disabilities, they have a higher risk for developing secondary conditions that may further affect their health and quality of life.The goals of this project are to develop and evaluate new approaches of treatment for children with cerebral palsy (CP) and to develop low cost tests for evaluating motor functions in natural environments.