BMX cycling is currently enjoying substantial popularity rivalling its heyday in the 1980s, due in part to its inclusion at the Beijing Olympics. The two main forms are track and freestyle.
Races are fast and aggressive sprints on purpose-built, off-road, single-lap tracks, with eight riders competing shoulder to shoulder.
The number of tracks and events is increasing fast, and you can find a list of events on the British Cycling website.
You can also ride the London 2012 Olympic track at Lee Valley, which opens in March 2014.