Bicycles have been and are employed for many uses:
Utility: transportation, bicycle commuting, and utility cycling
Work: mail delivery, paramedics, police, couriering, and general delivery.
Recreation: bicycle touring, mountain biking, BMX, physical fitness, and play.
Racing: track racing, criterium, roller racing and time trial to multi-stage events like the Tour of California, Giro d'Italia, the Tour de France, the Vuelta a España, the Volta a Portugal, among others.
Military: scouting, troop movement, supply of provisions, and patrol. See bicycle infantry.
Entertainment and performance: Artistic cycling, Freestyle BMX.
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