Remote Therapeutic Monitoring Exercise Tracking

This study tests whether using a smartphone app to remotely monitor exercise and physical activity helps people with Parkinson's disease or multiple sclerosis stay active and meet their personal movement goals, without needing to visit a clinic. **You may be eligible if...** - You have a diagnosis of Parkinson's disease (Hoehn and Yahr stage 1–3), Parkinsonism, or Multiple Sclerosis - You are able to walk as your primary way of getting around (with a single cane or walking stick allowed) - You have a personal goal to improve your physical activity - You own and use a smartphone - You agree to the app's terms and conditions **You may NOT be eligible if...** - You have cognitive or communication difficulties (including dementia) that would prevent you from using the app effectively Talk to your doctor to see if this trial is right for you.