Tottenham fullback Kyle Walker says the secret of his success is his superior fitness.

Walker believes opposition wide players are less likely to track his modern playing style when he exploits the full length of the field.

"If I'm taking my winger the other way all the time he's not going to want to keep with me," he told The Sunday Times.

"Nine times out of 10 I'm going to be fitter and no winger wants to defend."