Motivational Interviewing and Physical Activity Change in Parkinson's Disease

Inclusion Criteria: * Community dwelling * Age 18 or older * Physician confirmed diagnosis of PD with Hoehn and Yahr stage ≤3 * Ability to ambulate independently (walker is allowed) for distance of 50 feet or 10 minutes at a time * Does not meet current CDC physical activity guidelines of 150 minutes of moderate to vigorous physical activity per week * Currently and plans to have a smartphone, tablet, or computer and access to the internet for the next 9 months * Willing to monitor activity on their smartphone, tablet, or computer via a web-based application during the 9-month program * Currently uses the internet in a basic capacity Exclusion Criteria: * Inability to speak and understand English * Has a cardiovascular disorder or other health condition that would make exercise unsafe according to their physician * Patients who are currently receiving physical therapy or received physical therapy one month prior to study enrollment * Cognitive impairment as defined by inability to provide informed consent and to self-report feelings and behaviors * Montreal Cognition Scale (MOCA): rating of less than 24, indicative of cognitive dysfunction * Patients who indicate it is not recommended they participate in increased physical activity as indicated by the Physical Activity Restriction Questionnaire (PAR-Q) * Patients who are in other studies that monitor fitness or physical activity