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An exercise bicycle or bike, or stationary bicycle, or Exercycle is a device with saddle, pedals, and some form of handlebars arranged as on a bicycle, but used as exercise equipment rather than transportation. A cycloergometer, cycle ergometer or bicycle ergometer is a stationary bicycle with an ergometer to measure the work done by the exerciser.

An exercise bicycle is usually a special-purpose exercise machine resembling a bicycle without true wheels, but it is also possible to adapt an ordinary bicycle for stationary exercise by placing it on bicycle rollers or a trainer. Rollers and trainers are often used by racing cyclists to warm up before racing, or to train on their own machines indoors.

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