Baby's breath
Liz Hayes and Nael Nacer take a breather. Photo: Andrew Brilliant.One thing is clear about Lungs. You have to have amazing lung power to perform it.Particularly if, like the talented Liz Hayes (above, with the equally gifted Nael Nacer), you're trying to put over the nameless "W," who comprises only half the cast of Duncan Macmillan's two-hander (through March 10 at the New Rep), but who is talking for somethin…