LIST: Four players who played as a back and forward

Vernon was capped 24 times by Scotland. He went to the 2011 World Cup in New Zealand as a No 8 and was then picked for the 2015 tournament in England as a centre after undergoing the conversion to back due to the surfeit of back-row forwards at both Glasgow and Scotland. He was the first Scot since the 19th century to be capped as both a forward and a back.

Youngs is the son of former Leicester and England scrum-half Nick Youngs, and the elder brother of current Leicester and England scrum-half Ben Youngs. Originally a centre/winger he changed to play at hooker after advice from then Tigers’ coach Heyneke Meyer. What might surprise you is how rapid and small he was. Check this out.

Lomu started his rugby union career in the forwards, mostly as an openside flanker (no.7), sometimes to the blindside (no.6), before switching to the left wing in what he described as the "best move he could have made". He did move back into the pack at the end of his career, starting number eight during his stint with Marseille Vitrolles.

Who could forget this odd position change? The cross-code star came into rugby union and quickly impressed playing in the back-row for Bath in the Premiership. However, England and Stuart Lancaster then started him in the centre at the 2015 Rugby World Cup. Fans up and down the country are still trying to work that one out.