I believe the research has shown that almost any type of vigorous workout is good for your PD symptoms. For me, its various forms of cardio (treadmill, elliptical, bike); Tai Chi; Chi Cong (Qigong) breathing, stretching and balance exercises; and lots of walking. I only do light weights. However, I think dance, boxing, bicycle, etc. would be just as good. You just have to stick with it as a consistent routine. The old "use it or lose it".