I had a checkup today and the doc reminded me that he mentioned cycling at the last exam. I used the laptop and found Dr Finney's post. While on a tandem bike with a woman with PD Dr Finney noticed her symptoms such as handwriting and balance were markedly improved. He says cycling at 90 revs per minute might improve PD. Any stronger evidence suggesting this is so? I mounted my fat-tire bike to a trainer. The problem is fat tires make a helluva racket. So a switched to street tires but haven't tried it yet.