Table 1 The specific sedentary behaviour content delivered in the Movimente intervention

Teacher training

- General teachers^a

- Physical education teachers

• Topics of teacher training:

Prevalence of sedentary behaviour among adolescents; excessive sedentary behaviour and harms to health; sedentary behaviour concept (i.e., sitting time and ST), ST guidelines and possible activities to perform with students to reduce sedentary behaviour.

• Topics of educational material delivered:

Suggestions of sedentary behaviour breaks at class room; how to approach the theme of sedentary behaviour in all school subjects.

• Online support (i.e., email and social networks during all academic year).

- Soon after baseline data collection, at the beginning of the year;

Educational curriculum

- School managers and teachers

• Delivery of banners and folder:

Screen time messages (e.g. excessive ST is bad for your health; try to reduce your ST and spend more time with your family and friends.).

• It was suggested to teachers and coordinators to performed activities with students in order to show the folders to parents or guardians to disseminate this information.

- The folders were delivered every two months;

- The banners were delivered at the beginning and middle of the year.

School environment^b

- Out of classroom spaces at school

• Revitalization of old courts;

- The environmental change occurred at the beginning of the year.