Guest Editors' Introduction From Dr. Grossberg and Dr. Chand.

The motor symptoms of PD are key in the early diagnosis of the disease and are the most-impactful throughout the course of PD. According to the Parkinson's Foundation, at present nearly one million persons in the US suffer from Parkinson's Disease (PD). Prescribing exercise for PD patients is vitally important in improving motor symptoms in PD as well in improving anxiety/mood symptoms and quality of life. [Extracted from the article]