Tony Hibbert has said that Roberto Martinez is happy for Everton's defenders to play a more attacking role for the team.
The 33-year-old has featured regularly for the Toffees over the last month while Seamus Coleman has been sidelined with a hamstring injury.
He told the club's website: "I think the system he plays means he's happy for us to go forward and get involved more but we've also still got to keep a defensive mind in that when we do attack.
"It's difficult [getting up and down], you've got to be fit to do it but you can pick and choose your times to get forward, but the system also means that, if we do get caught out going forward, there may be one or two midfielders that can help out behind you.
"That's the modern age now and the full-backs have to get forward as much as possible."
Everton face Aston Villa in the Premier League next weekend.