The Mark Morris Dance Company has a special program for Parkinson’s patients. Whole body movement reduces the tremors and they have been working with that fact, now, through dance for years (https://danceforparkinsons.org). My late friend, Ed Pincus, had Parkinson’s and practiced the martial art aikido. I would see him shake at the edge of the mat and then step on the mat to practice without any tremors. His last film, One Cut, One Life, http://onecutonelife.com, shows some of his process.