“…49 External barriers, those attributed to social and environmental-related factors, include access to resources such as safe exercise environments, transportation, disposable income, and exercise partners. Both internal and external barriers have been identified as real challenges to physical activity participation for persons with conditions managed by physical therapists, including osteoarthritis, 29 chronic pain, 1,21 low back pain, 16,19 and stroke. 36,45 There is limited research on interventions to change internal barriers to physical activity, and fostering long-term change in physical activity participation has had only partial success.…”