**Motor and Cognitive Exercise in Parkinson's Disease** This study looks at how special exercises might help people with Parkinson's disease (PD), a condition that affects movement and balance. People with PD usually experience issues with walking and thinking. In this study, 48 patients who have had PD for 4 or more years will be divided into two groups. One group will continue their regular PD care, while the other group will do special exercises for both movement and thinking. These exercises will be done three times a week over 12 weeks and will include treadmill walking and strength exercises, especially for the legs. **Key Points:** - The study lasts 12 weeks, with follow-up checks at 6 and 12 months. - Participants will do exercises under supervision, alongside their regular PD treatments. - Results will help decide if a bigger, international study should be done. Participants must be at least 18 years old, able to walk independently, and have had PD symptoms for at least 4 years. People with PD dementia, a type of severe memory and thinking problem, cannot join.