Exercise (3) jeunesse (2) ethnologie (2) Youth (2) Ethnology (2) Anthropology (2) Youth (2) territoire (1) sport (1) échantillonnage (1) participation (1) surveillance (1) information (1) Economic conditions (1) Monitoring (1) Methods (1) Teenagers (1) Rates (1) Week (1) Ci (Chinese poetry) (1) Success (1) Sports (1) Socioeconomic status (1) Social status (1) Sex (1) Science (1) Sampling (1) Population (1) Participation (1) Mechanical drawing (1)