According to Patrice Evra: "Full-back is the most difficult position to play."
The former Monaco, Manchester United and Juventus left-back, now at Marseille, has seen the metamorphosis of his position through a long career.
"I've had teammates who've filled in at full-back and said: 'You must be mad to play in this position for all of these years, you have to do everything,'" he told ESPN FC.
"The best full-backs have always attacked, always pushed forward and overlapped. I don't think that has changed, but the full-backs for the best teams are more advanced than they have ever been.