By JOCELYN NOVECK, AP National Writer

At one point deep into “Christy,” the boxer Christy Martin, played with ferocious commitment by Sydney Sweeney , describes how she feels being in the ring. It’s not what you’d expect.

It’s where she finds quiet, she says.

Such a line at the beginning of this two-hour plus film would have been laughable, given that the ring is obviously hectic, loud, bloody — and terrifying, to most of the world. But when Martin says it, we get it. The ring is where Christy can be in control. Outside — and especially at home, in the bedroom — is where life gets truly scary.

“Christy,” directed by David Michôd, begins as a solid sports biopic, the based-on-true-events story of Martin, a hot-tempered teen from coal-mining country who fell into boxing and became a t

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