According to the advert - did I say advert, I meant "article" - in the Telegraph, this is the future of cycling:
A tiny motor, attached to a back wheel, stores up energy from pedal strokes to help power the bike.
When you get tired, or reach a hill, it can push you along at up to 10 times your regular power.
Leaving aside any Fabian Cancellara jokes, this sounds like both a good idea and sacrilege.