f soccer: Rugby Union and Rugby Football

Rugby union, often simply referred to as rugby, is a full contact team sport which originated in England in the early 19th century. One of the two codes of rugby football, it is based on running with the ball in hand. It is played with an oval-shaped ball on a field up to 100 metres (330 ft) long and 70 metres (230 ft) wide with H-shaped goal posts on each goal line.

Rugby football is a style of football named after Rugby School in the United Kingdom. It is seen most prominently in two current sports, rugby league and rugby union.

William Webb Ellis is often credited with the invention of running with the ball in hand in 1823 at Rugby School when he allegedly caught the ball while playing football and ran towards the opposition goal. However, the evidence for the story is doubtful. In 1845, the first football laws were written by Rugby School pupils; other significant events in the early development of rugby include the Blackheath Club's decision to leave the Football Association in 1863 and the split between rugby union and rugby league in 1895.

Historically an amateur sport, in 1995 the International Rugby Board (IRB) removed restrictions on payments to players, making the game openly professional at the highest level for the first time. The IRB has been the governing body for rugby union since its formation in 1886. The spread of rugby union grew from the Home Nations of Great Britain and Ireland, and was absorbed by many of the countries associated with the British Empire.

Early exponents of the sport included Australia, New Zealand and South Africa. Countries that have adopted rugby union as their de facto national sport include Fiji, Georgia, New Zealand, Samoa, Tonga and Wales. Rugby union is played in over 100 countries across six continents and as of November 2010 118 unions were members of the IRB.

The Rugby World Cup, first held in 1987, takes place every four years, with the winner of the tournament receiving the Webb Ellis Cup. The Six Nations Championship in Europe and The Rugby Championship in the Southern Hemisphere (the latter replacing the Tri Nations) are major international competitions held annually. Major domestic competitions include the Top 14 in France, the English Premiership in England, the Currie Cup in South Africa, and the ITM Cup in New Zealand.

Other transnational competitions include the Celtic League, originally involving Irish, Scottish and Welsh teams and now Italian teams as well; Super Rugby (previously Super 12 and Super 14), involving South African, Australian and New Zealand teams; and the Heineken Cup, involving the top European teams from their respective domestic competitions.

In rugby union, the International Rugby Board the size and shape of the ball under Law 2(also known as Law E.R.B); an official rugby union ball is oval and made of four panels, has a length in-line of 280–300 millimetres, a circumference (end to end) of 740–770 millimetres, and a circumference (in width) of 580–620 millimetres. It is made of leather or suitable synthetic material, and may be treated to make it water resistant and easier to grip. The rugby ball may not weigh more than 460 grams or less than 410 and has an air pressure of 65.71–68.75 kilopascals, or 0.67–0.70 kilograms per square centimetre, or 9.5–10.0 lbs per square inch. Spare balls are allowed under the condition that players or teams do not seek an advantage by changing the ball. Smaller sized balls may also be used in games between younger players. Much larger versions of traditional balls are also available for purchase, but these are mainly for their novelty attraction.