Shaun Edwards accepts Wales face a huge World Cup challenge when they attempt to pull the plug on England's "electric" backs at Twickenham next weekend.
Wales defence specialist Edwards says no stone will be left unturned during preparations to shackle all-singing, all-dancing England stars like Anthony Watson, Jonny May and Jonathan Joseph.
"You have to counteract certain aspects of the attacking strengths," Edwards said.
"England backs have fantastic footwork, so I won't hide the fact we have been practising against people with good feet.
"If you look at the back-line in Anthony Watson and Jonny May, while Jonathan Joseph is probably in the top three No.13s in the world, we are fully aware of the threat.
"England have scored the most points in the last two Six Nations, so we are playing against a very potent attacking team who can hit you.
"They have some electric backs and play expansive rugby, but they can also hit you through the forwards. We have got our hands full and know we have a huge challenge ahead, but we are preparing well."