Inclusion Criteria:  Age 8- 17 years Symptoms of anxiety and/or depression Youth display reduced daily physical activity (less than 30 mins. pr. day and/or does not partake in physical leisure activities, and/or does not participate in physical education in school). The youth is motivated to partake in physical activity  Exclusion Criteria:  Physical activity is not advised for medical reasons Severe learning disabilities and the youth is unable to understand the study protocol Specific psychiatric disorders including any eating disorder, psychosis Severe challenging behavior or other needs requiring constant one to one support