| Thanks for the advice, Ronin. I probably won't change to an out-side bicycle simply because my reason for staying at home is a bad back, not the weather.
I actually had to modify how I use the stationary bike though - the bike is an old, used one & the seat couldn't be raised at all, so I fashioned a seat *behind* it which I sit on & pedal, as if it were a recumbant bike. It's actually very comfortable that way, and takes some stress off my back.
I used to ride 10 miles a day, 6 days a week - to & from work - but had to stop when the back pain got to be too much from the bending-forward position, so I'm glad it turned out this way, actually.) | 
