The study looks at how dance affects energy use in adults with Parkinson's Disease (PD). Parkinson's is a condition that affects the brain and can cause problems like shaking and difficulty moving. The study uses cameras and activity trackers to measure how much physical activity people with PD do during dance classes. Participants will also fill out surveys about their daily activities and health. **Key Points:** - The study involves wearing an activity monitor for 9 days and attending dance classes. - Participants will have a scan called an iDXA and share their thoughts on using technology in dance. - The study aims to find out how intense these dance sessions are and how they impact health. **Eligibility:** - Adults aged 18-85 with a confirmed diagnosis of PD. - Participants should be enrolled in Dance for PD® classes. - Certain health conditions or medication use may exclude participation. This study helps understand the health benefits of dance for people with PD. Participants can contribute to important research and learn more about their physical activity levels.