cycle machine - around a track

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I'm positive that over the last couple of years I came across (in a advert i think) a cycle machine that if fixed and can be used in the home. Only this cycle machine was connected to a screen - which allowed you to view yourself as a character going around a track. The faster you pedelled the faster the character goes round the track.

I'm looking for anyone who knows anything about this. or have even heard of such a thing, the name of the machine, or a link to a website would be suitable?

thanxs