LIST: Which rugby players have also competed in Olympic sports?!

A Canada international in rugby union, both in 15s and sevens, and member of the World Rugby Hall of Fame, Moyse also won gold medals in two-woman bobsleigh at the 2010 and 2014 Winter Olympics, and represented Canada in cycling. In addition, she played soccer and ran track at university level.

Best known for his rugby feats in a golden age for the game, flying winger JJ Williams earned 30 caps for Wales and played a key role in their 1974 invincible series win against South Africa.

He also used his blistering pace to good effect on the athletics track, and ran for Wales in the 4x100m at the 1970 Commonwealth Games. His strong athletics genes were passed down to his son, Rhys Williams, who won the 2012 European 400m hurdles title.

An extraordinary chap in anyone's book, C.B. Fry was an English renaissance man active in the late 19th and early 20th centuries. Arguably the greatest all-round sportsman in history, he represented England at cricket and football, making an appearance for Southampton in the 1904 FA Cup final.

His athletics was red-hot too. He set a British long jump record in 1892 before equalling the world record with a leap of 7.17m the following year (after a good lunch and a cigar, apparently). Oh, and did we mention he played rugby for Cambridge University, Blackheath and the Barbarians, too? One wonders where he found the time.

A promising sprinter as a youngster, Ugo Monye competed at the English Schools Championships as a 100m sprinter before focusing on rugby. Monye went on to enjoy a highly accomplished rugby career earning 14 caps for England as making two Test appearances for the British Lions in 2009 before retiring earlier this year. His sister Chinedu was a silver medallist at the English Schools Championships in the 200m.

PIC FROM CATERS NEWS - (PICTURED SEPTEMBER 09: Quilter Kids First Champions Canvey Island RFC. The club was visited by Ugo Monye and Danielle Nolli Waterman.) PR SHOOT FOR ESSENTIALLY / George Maclachlan[/caption]

We are not entirely sure of the rugby qualities of the world pole vault record holder, but Lavillenie is a passionate supporter of top French rugby team Clermont Auvergne.

In fact, ahead of a 2010 European club clash between his favourite team and English side Saracens, he entertained the fans by popping nonchalantly over the 3m high crossbar.

Aged 18, blisteringly fast Welshman Nigel Walker chose to focus on athletics over rugby, his other passion.

Walker went on to represent Great Britain in the 110m hurdles at the 1984 Los Angeles Olympics Games. He later won 60m hurdles bronze medals at both the European indoors and world indoors.

Aged 29 he returned to rugby where he won 17 caps for Wales, scoring 12 tries. Today Walker works as National Director at the English Institute of Sport.

Determined to make the Rio Olympic Games but believing his chances were slim as a 10.24 100m sprinter, American Carlin Isles decided to switch to Rugby sevens three years ago. It has proved an inspired move; within months he was playing for the USA and he was quickly branded "the fastest man in rugby".