Nan Cyclist, I just want to say again how much I appreciate your very helpful story & tips, which I intend to act on, and the inspiration you provide to me and others. Your posts are a good example of exactly the type of thing I hope to find on this forum--people with PD sharing information, tips, hope, personal experiences that may be helpful. I do a lot of exercise--dance class, dance performance group for PD, aquatics class, yoga, dog walking, etc. But I really believe I need more strenuous & more frequent aerobics, and stationary biking seems to be ideal for that. I'll keep on trying to work out the best way for me to accomplish it, but meantime, godspeed!