....that fount of wisdom, said something along the lines of- "Nobody really cares if you can't dance, so dance!"
I suspect that ths is the single greatest exercise program we could adopt. It does aerobic, stretching, balance, and strengthening all at once. It uses the music to overcome the PD. It probably encourages new neural growth. It is free and can be done in the privacy of your home (at least if you don't put it on youtube

). And you feel so damn cool so long as you don't watch the video