Cycling is a recreation, a sport, and a means of transport across land. It involves riding bicycles, unicycles, tricycles, and other human powered vehicles (HPVs).
As a sport it is governed internationally by the Union Cycliste Internationale in Switzerland (for upright bicycles) and by the International Human Powered Vehicle Association (for other HPVs).

Bike trials riding
Bicycle racing
Bicycle touring
Bicycle commuting & transport
Challenge riding
Cyclist
Indoor cycling
List of cycleways
Mountain biking
Offroad cycling
Road cycling
Sustrans
Track cycling