E ach morning before filming Lollipop, Posy Sterling took a giant bucket outside, filled it with ice and climbed in. Never mind that it was November or that her call time was at 5am; the actor would take daily dips in the freezing water in the dark. In Lollipop, Sterling plays a headstrong mother who has recently been released from prison and is fighting to win back her kids. The role is heavy, but the ice baths meant she started the days feeling light. “I just found it euphoric,” she says. Tickled, her driver started bringing her more ice as part of her ritual.

Today, Sterling, 32, is similarly full of beans, buzzing from two coffees and fresh from six weeks in New York. “I haven’t slept,” she says brightly. The actor has been quietly building her profile since Screen International na

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