How do youth perspectives on physical activity differ across childhood?

There is consistent evidence that physical activity declines across childhood, yet few studies have examined children’s perceptions of physical activity across a broad youth age spectrum. This study aimed to explore perceptions of physical activity among children/youth ages 5–18 years, and to examine the extent to which perceptions differed by age and/or sex. U.S. children in grades K-12 (N = 146) completed an individual interview to answer questions about physical activity (i.e. what it is, why they should do it, and facilitators/barriers from parents, friends, and school). Responses were transcribed and categorised using qualitative content analysis; frequencies of responses to each question were compared across sex and age groups. Response patterns did not differ by sex, but did differ by age. Descriptions of physical activity and preferred activities focused more on exercise and health versus informal play and fun as children aged. Older children reported more barriers from friends and school, and less co-participation with parents than the youngest children. These findings can inform future efforts to promote physical activity among youth. Interventions should work through key socialising agents (parents, friends, and schools) to promote co-participation in enjoyable activities with family and friends, and to infuse movement opportunities throughout the school day.