Background & objectives: Perceived self-efficacy is an effective factor for physical activity. This qualitative study explores the determinants of family's self-efficacy for physical activity.

Methods: This qualitative study was performed through content analysis method. Data were collected through semi-structured interview. 20 participants were included in the study using purposive sampling method. Constant comparative analysis was applied for data analysis.

Results: The gathered data were included in four main categories; environmental status, parents’ role, competitive activities and readiness for physical activity. The main theme derived from this study was "Lack of priority for physical activity in family daily life".

Conclusion: Regarded to the main theme and four categories derived from this study, physical activity has poor priority in families’ daily life. Introducing physical activity as a value and developing active lifestyle are recommended for families.