I couldn't stand being inactive any longer, so I went out on a limb and started riding a stationary bike for 1/2 hour, 3 times a week and it actually seems to be helping, It seems to stretch and strengthen the muscles and tendons in my feet and has made the PF much less painful.
I wear Birkenstock inserts in my tennis shoes for extra arch support and also ice my feet immediately after biking. I have not noticed any increased pain due to this activity - the inserts and icing may be a factor in this. Has anyone else experienced these results from stationary biking?
I also want to note that before I stand up first thing in the morning, I roll my feet on tennis balls. I have found this to be the best way to reduce (but not eliminate) that extreme pain that we all experience when we take our first steps in the morning.