FitSpirit physical activities and events are organized by participants' schools during the school year. Girl-only activities such as physical activity sessions, speaking engagements, turnkey running program and special events can be offered. The number, type and frequency of activities are decided by each school.

The study evaluates the effects of the FitSpirit intervention on divers health markers of adolescents. Participants freely register to the intervention via their school. Physical activities and event are organized by the schools with the help of the FitSpirit organization.

An online questionnaire assesses physical activity participation. It is measured using the number of days per week the participant are active more than 60 min/day (scale 0 to 7 days/week).

An online questionnaire assesses eating habits. They are measured using the number of servings consumed per week for each of the different food categories (fruits, vegetables, juice, milk products, sweetened beverages, and fast food). No aggregation is done.

An online questionnaire assesses sleep habits. They are evaluated based on the usual number of hours of sleep (hours per night).

Physical self-efficacy is assessed using an online questionnaire by asking the participants their level of agreement with 12 statements, using a 5 level scale. Points are attributed to each answer (Disagree totally: 1; Somewhat disagree: 2; Neutral: 3; Somewhat agree: 4; Agree totally: 5). Total score is used to compare the participants and highest score represents a better outcome.

Physical self-perception is evaluated using an online questionnaire presenting 2 sets of 7 silhouettes. Participants identify first the silhouette representing best their current body image. They then identify the silhouette representing their desired body image (slimmest silhouette: 1 point; fattest silhouette: 7 points). Satisfaction of body image is calculated by the difference between the 2 answers. Smaller difference score represent better satisfaction of body image.