Short Term Effects of a Multimodal Intervention With RGM on Cognition in People With Parkinson's Disease.

The goal of this clinical trial is to learn if the Ronnie Gardiner Method (RGM) works to improve cognitive functions in adults with Parkinson\'s disease (early to mid-stage). It will also learn about the secondary effects on speech, mobility, balance, and mood. The main questions it aims to answer are: * Does a 10-week RGM intervention improve cognitive aspects, speech (indirectly through improved breathing), mobility, and balance in participants with Parkinson\'s disease? * How do participants experience the intensity, difficulty, and emotional impact of the RGM sessions?