People with Parkinson's disease are more willing to do additional exercise if the exercise program has specific attributes: a discrete choice experiment.

Question: What specific attributes of exercise programs influence the preferences of people with Parkinson's disease for additional exercise compared with their current practice? What trade-offs are participants willing to make between exercise program attributes?

Design: Discrete choice experiment.

Participants: Five hundred and forty people with Parkinson's disease.

Intervention: Participants decided whether they would adopt a hypothetical program in addition to their current exercise routine.