Hi Gregg,
I saw this one too. I thought what a daft idea to use a tandem with a friend or relative peddleing like fury to make your legs reach a certain revolution.
Surely the easiest way would be to motorise an exercise bike!!!
That way, you are not in peril from cars etc, you do not have to phone your friend daily to come and pedal the tandem, and so on.
With a motor fitted to your exercise bike, and a rheostat to vary the speed, you would be totally independant on others.
I have an exercise bike which I lent to my son. I want to get it back and try it.
Ron