This study is about understanding how brain activity and balance are connected in people with Parkinson's Disease (PD). Parkinson's Disease is a condition that affects the brain, leading to problems in movement and sometimes causing balance and thinking issues. The study will look at how exercises and special electrical stimulation can help improve balance and brain activity. Brain excitability means how easily the brain responds to signals, which can be different in people with PD compared to healthy people. Researchers want to test ways to make the brain work better using electrical stimulation and balance exercises. They hope this will help PD patients move more safely in daily life.

• Study includes physical therapy and electrical stimulation sessions.
• Participants must not have leg injuries or osteoporosis.
• PD patients with additional nervous system injuries are not eligible.