Conclusions this study showed the feasibility of implementing a clinical program based on pa intervention and cancer prevention description of the problem to support the use of physical activity for mental health promotion, a critical review of evidence was conducted to of practice guidelines with case study include 17 recommendations relating to and social dimensions of mental the presentation will outline the guidelines designed for practitioners free recess on children’s recess behaviour. this knowledge is asked for by school boards, health professionals and politicians to inform future policies and actions. therefore, the aim of this intervention study is to investigate the effect of device-free recess on schoolchildren’s physical activity and social interaction. methods during april-june 2020 device-free recess environments will be implemented at seven danish schools. children will be asked to place their mobile phones, tablets and computers in locked? device-hotels? during recess for a four-weeks inter- vention period. among a cohort of 900 children from grades 4-6 (10-13 yrs.) physical activity and social interaction during recess will be measured before and during the last intervention week using questionnaire systematic observation