Genetics and Aerobic Exercise to Slow Parkinson's Disease Trial

Inclusion Criteria: 1. Adult with a diagnosis of PD by a physician or physician extender 2. Hoehn and Yahr stage I-III 3. Demonstrate the ability to safely mount and dismount a stationary cycle 4. Reliable transportation to the community exercise facility 5. Smartphone device for activity data monitoring 6. On a stable dose of anti-parkinsonian medication Exclusion Criteria: 1. Participation in disease modifying PD-related clinical trial or study 2. Diagnosis of dementia or any neurocognitive impairment that compromises one's ability to provide informed consent. 3. Implanted deep brain stimulation electrodes or focused ultrasound for PD management 4. Recommendation for medical clearance using the American College of Sports Medicine (ACSM) Preparticipation Health Screen a. If the ACSM screen recommends medical clearance, the participant must obtain medical clearance by their health care provider prior to participation. b. Those who choose not to obtain physician clearance will not be eligible for participation. e) A musculoskeletal issue (arthritis, osteoporosis, back problem) that would limit one's ability to engage in a cycling intervention f) Neurological disease other than Parkinson's disease (i.e. multiple sclerosis, stroke) g) Current cardiac arrhythmia