Some may have read this before but I will repeat it.My husband has had a tremor in his Parkie side foot for near enough 26 years,maybe longer.The Parkinson's only fully showed itself when he damaged his Archilles tendon and had to lay off running for a while. To me, I think heavy strenuous forced pace exercise is important for PwP .To me whether it slows the progression, or just makes life easier at that time is the real question.