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Sydney Sweeney revealed how she lost more than 30 pounds in seven weeks following the filming of her new movie, "Christy."

The 28-year-old actress underwent a dramatic physical transformation and trained intensely to play the legendary boxer Christy Martin in the biographical sports drama. But afterward, she had a short turnaround to lose the excess weight before filming her upcoming movie, "The Housemaid," and the third season of her hit HBO series "Euphoria."

During a new interview with People magazine, Sweeney explained how she quickly shed the pounds.

SYDNEY SWEENEY GAINED 35 POUNDS, SUFFERED CONCUSSION FILMING NEW MOVIE

"I had to be really strict with myself," she said.

"When I was training, it was really hard to

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