1. cycling; bicycling
Wikipedia definition
2. CyclingCycling, also called bicycling or biking, is the use of bicycles for transport, recreation, or for sport. Persons engaged in cycling are cyclists or bicyclists. Apart from ordinary two-wheeled bicycles, cycling also includes riding unicycles, tricycles, quadracycles, and other similar human-powered vehicles (HPVs). Bicycles were introduced in the 19th century and now number about one billion worldwide. They are the principal means of transportation in many regions.
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