i don't take anecdotal evidence very seriously but there are enough clinical trials studying exercise we shall know soon. that said, i recently purchased a recumbent stationary bike. my plan has been to exercise every day and burn 10 more calories/day until i reach 200 calories/day, which should take an hr. of exercise at my selected resistance level. it's been a month, it takes about 40min to burn 150 calories.
i haven't paid attn to rpms but i'll start. you have to be in pretty good shape to go 1-1.5hrs/day, it's also very boring.

strenuous exercise makes everyone feel better, pd or not. the release of endorphins must help temporarily. building cardio helps, the person is likely losing weight, maybe eating less, sleeping better, maybe just is happier from the general benefit of exercise . but personally i have see no reduction in my pd symptoms, while what i eat or how well i sleep has a major affect.

i'll maybe modify my routine but that's a lot of work!