Being one that has gained some benifit from exercise I can't totally discount this study but I can't completely agree either.
Here is my problem with this study. "Just one hour of fast walking a day alone could delay the disease," said Professor Kim.
Excuse me Professor Kim, I have PD and my gait has been reduced to a shuffle. I can not walk fast enough to get any benifit from walking. Not to mention the hazard of loss of balance and falling.

GregD