Endurance Exercise & Virtual Reality for Optimizing Cortical Excitability and Neuroplasticity in PD

This study tests whether combining endurance exercise (like cycling or walking) with virtual reality (VR) sessions can improve brain function and balance in people with Parkinson's disease (PD). VR can make exercise more engaging and may provide additional stimulation to the brain, potentially enhancing the benefits beyond exercise alone. **You may be eligible if...** - You are 18 to 85 years old with a confirmed diagnosis of Parkinson's disease (idiopathic PD, stages 2-3) - You score at least 23 on a cognitive screening test (indicating adequate mental function) - You have some balance difficulty but are still able to participate in exercise **You may NOT be eligible if...** - You have had a stroke, multiple sclerosis, or other neurological conditions - You have severe heart or lung disease, uncontrolled high blood pressure, or severe diabetes - You have had deep brain stimulation surgery - You are pregnant - You have epilepsy or seizures - You take medications that could affect seizure threshold or brain stimulation effects Talk to your doctor to see if this trial is right for you.