The study was a group randomized controlled trial. Within each school Classes of high school students were allocated by randomization to the intervention or control group by a function Randomization in Excel program. Outcomes were measured by questionnaire at pre- intervention, post-intervention and 3-month follow-up. The study protocol was approved by Tel Hai college institutional review board. Parents of all participants, in the intervention and in the control group, received information about the program and the study and were choose whether to provided informed consent or not.

Participants and setting Two high schools were recruited for the study, in each school classes from grades 9th and 10th were chosen to participate in the study all mixed gender classes. The two high schools are in northern Israel, one in a rural area and the second in a small city, both serving the Jewish population. The size of the schools were similar. All data were collected within the school setting.

Program description "Towards a more resilient self" is an interactive, cognitive behavior program aiming to address low resilience, low self-esteem and body dissatisfaction. The program contains a range of coping strategies to help adolescents improve resilience, self-esteem and body image. The program consists of nine 90-min sessions delivered by one group leader in the presence of the classes' teachers. Participants in the control group received one session of 90 minutes with health nutrition education.

Inclusion Criteria:

• Participants who filled out the questionnaires before and after the program, and if their parents have signed a letter of agreement

Exclusion Criteria:

• Participants who do not completed the questionnaires at least twice