A fall onto props could also cause serious injury. Traditionally, unicycling has been seen as a circus skill which has been performed at events to entertain the public in the circus or during parades, carnivals or street festivals. Recent developments in the strength and durability of bicycle (and consequently unicycle) parts have given rise to many new activities including trials unicycling and mountain unicycling. Unicycling is arguably now as much a competitive sport and recreational pursuit as an entertainment activity. The principal types of unicycling are:         Unicycling is also performed as a team sport. Unicycle basketball uses a regulation basketball on a regular basketball court with the same rules, e.g., one must dribble the ball while riding. There are a number of rules that are particular to unicycle basketball as well, e.g., a player must be mounted on the unicycle when in-bounding the ball. Unicycle basketball is usually played using or smaller unicycles, and using plastic pedals, both to preserve the court and the players' shins. In North America, regular unicycle basketball games are organized in Berkeley, San Luis Obispo, Detroit, Phoenix, Minneapolis, and Toronto. Switzerland, France, Germany and Puerto Rico are all field teams. The Puerto Rico All Star Unicycling Basketball Team has been one of the dominant teams and has won several world championships. Unicycle hockey follows rules basically similar to rink hockey, using a tennis ball and ice-hockey sticks. Play is mostly non-contact. The sport has active leagues in Germany, Switzerland, Australia and the UK and international tournaments held at least bi-annually. Tournaments in the UK are held by various teams across the country usually in sports halls, but occasionally outside. Each tournament lasts a day and around 8 teams normally compete in a round-robin league with the winner being whoever has the most points. If two teams have the same number of points the winner can be decided by goal difference or a penalty shoot-out. Don Snowden (7 April 1988). Andrew Tosh Shoulders Reggae Legacy. "Los Angeles Times" (retrieved 16 November 2014)  UNICON, Eurocycle and APUC are regular international unicycling conventions. The biennial UNICON (International Unicycling Convention), sanctioned by the International Unicycling Federation, comprises all major unicycling disciplines and is a major event on the international unicycling calendar. Events include: artistic (group, pairs, individual, standard skill, open-X), track racing (100 metres, 400 metres, 800 metres, 30 metres walk the wheel, 50 metres one-foot), 10 kilometres, marathon (42.195 km), muni (cross-country, uphill, downhill, North Shore downhill), trials, basketball and hockey.