Family members and health care workers' perspectives on motivational factors of participation in physical activity for people with intellectual disability: A qualitative study.

Motivation for participation in physical activity might be promoted at the individual, contextual and interactional levels. The interactions between individuals with ID and their support persons should work in a supportive way and strengthen mastery experiences. Support and engagement in the context could serve as a prerequisite for motivation and participation in physical activity and should be considered when developing interventions for physical activity for individuals with ID.