Fortunately, Tumblr is -- as ever -- my friend, and points me in the direction of the Circular Bike. Lots of bikes welded into a circle, going nowhere.
As a lazy person, the circular bike strikes me as a nifty commentary on the pointlessness of exercise. I can hike around a shopping mall as well as the next woman (as long as she's not a marathon runner), but sitting on an exercise bike and peddling nowhere -- why would I do it? On the other hand, I have heard rumours that pedal power can be used to charge mobile phones. Aha! a use. Doh! I don't own a mobile phone (I'm not kidding. I am a tech failure freak. Possibly the word I'm searching for is Luddite).
So I'll be sitting here, not exercising. But do check out the circular bike -- it's banana yellow.