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 trailblazer for women in the sport. That’s t

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