Anonymous wrote:Stationary bike
+1000
I never would have guessed it, but even 15 minutes a day on an exerbike has made a huge difference for my knees that walking didn't do. I have a recumbent style bike that gets used periodically as I fall in and out of routines. My knees let me know when I haven't done it for a while. I recommend getting a used one for your home if you don't want to visit a gym regularly.