Methods for 11-17 year-old children, the pa and sed behavior were collected using an adapted youth risk behavior survey questionnaire. physical activity and sedentary duration were compared to the thresholds considered as safe (anses 2016): pa > 60 min/day and sed 20 min/day and sed >4h30/day) were set to disaggregate the population that does not reach these benchmarks, allowing to define nine profiles regarding the associated risks identified and updated in the literature. profiles were compared according to bmi and age using pearson chi-square tests. all statistical analysis were performed taking into account the survey complex sampling frame design and the individual weighting. results the preliminary results show nine risk-based profiles of children and adolescents (n = 1285) related to the risk thresh- olds that can be identified. the most at risk represented almost 50% of the 11-17 years old associated with the highest bmi. the highest (>4h30) profiles were observed in the oldest however, among them, regarding the updated having a high physical activity level were considered as at lower risk. conclusion finally, definition of profiles based on risk thresholds, >60 min/day and >20 min/day for pa and allows to character- ize the children and adolescents the most a risk in order to enhance the effectiveness of public health policy. the risk real behavior