What Triggered the Use of Vigorous Exercise to Treat Parkinson's Disease?

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One of the earliest stories was the story about a patient that could ride a bike with Parkinson's disease, whereas he was total unable to walk which stimulated interest in the bike itself and then other exercise studies begin to examine other things just than biking started to study tai-chi, tango dancing, yoga, Pilates and in fact the results were similar despite what type of exercise you were doing.