Individuals will be recruited through the Columbia University Medical Center Parkinson's Disease Center of Excellence. Individuals who choose to participate will first be given a brief evaluation, including history and contraindications for exercise, assessment of gait and balance, physical activity questionnaire (Brunel Lifestyle Inventory and International Physical Activity Questionnaire), pain questionnaire (Brief Pain Inventory), NeuroQOL quality of life assessment, and a self-efficacy measure about exercise engagement (Exercise Self Efficacy Scale). For those individuals who report low back pain, we will further administer the Modified Oswestry Low Back Pain Disability Questionnaire and a customized low back pain questionnaire. The therapist will then conduct the coaching session (see below). If this assessment is not able to be conducted in person, it will be conducted via secure videoconferencing. There will be between 1-4 follow-up phone call/videosessions and a follow-up assessments at 3 months and 6 months where all assessment will be repeated. A short questionnaire will also be administered at 3 and 6 months to assess the acceptability of the intervention.

The coaching program will utilize the Pre-Active PD program (Clinicaltrials.gov NCT03696589) to guide the delivery of the intervention. This will include a checklist of the key elements that are important for the therapist in order to facilitate PA behavior change. In addition, the therapist will utilize motivational interviewing strategies that include four processes (engaging, evoking, planning, and tracking) and five core communication skills (asking open ended questions, affirming, reflective listening, summarizing, and informing and advising). The therapist will introduce the Pre-Active PD workbook and utilize it as a tool and reference for the participant in order to engage and focus them throughout the coaching process, and will educate participants on the types of exercise options and the specific exercise benefits for PD. In the planning process, the therapist will facilitate discussion on development of specific and measurable goals, and will provide options for tracking their progress, such as written or web-based exercise logs or an activity monitor. The recommended exercises will be individualized to each participant but will primarily focus on increasing general physical activity (e.g. steps per day) as well as engagement in moderate-vigorous intensity aerobic exercise a minimum of three times per week. Balance and strengthening exercises will also be recommended as appropriate. At the follow up sessions (15-30 min), the therapist will review progress with the current exercise plan and progress, record if any falls have occurred and discuss barriers and facilitators for exercise engagement. Participants will also be given a short exercise safety checklist to assure safety when conducting home exercises. Participants will have the option to use a Fitbit device (Charge 4) to monitor their heart rate and physical activity during the course of the intervention period. Participants will use a study-specific login to track their progress and activity. Participants who already own a Fitbit or other activity monitor can continue to use their device during the study.