The incidence of Parkinson's disease is seen in all races. Almost 10 million individuals worldwide are affected by Parkinson's disease and the number is increasing as people live longer. Health-fitness professionals who work with the general public and older adults will encounter clients and patients with Parkinson's disease. Understanding the basics of the disease allows professionals to recognize disease progression and be aware of and learn how to manage numerous possible symptoms and related problems, allowing those with PD to live longer with better quality of life.