... I hate it! Even so, I am participating in a six month study here in Chicago measuring the impact of exercise on the PD brain and, with the help of a trainer, have been diligent. The results of the study are a way off, but I have to admit, it's been five months and this exercise thing has worked very well for me. I've lost weight, gained strength, sleep better, and have fewer and less prolonged symptoms. I'm also making some muscles and generally feel better, too.
One more point ... I had to go the New Jersey for a couple of weeks due to the unexpected death of a close friend and, due to the craziness, I had a two week layoff from my exercise regimen. Toward the end of the first week I started to weaken. Symptoms started coming on more often and with more intensity, and by the time I came home I was kind of a wreck. But I went back to my exercise program and have been there twice in the last four days, and I can already feel my strength returning and my symptoms abating.
There is something to this exercise thing, at least for me.