Jennifer Lawrence Got in Hunger Games Shape by Skipping

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To prepare for her Hunger Games role as the hardened tribute from District 12, Jennifer Lawrence trained hard. Teen Vogue spoke with her trainer, Dr. Joe Horrigan, who said Lawrence participated in archery lessons, scaled trees, did bouts of intense cardio, and ... skipped. "Jen's go-to [cardio] was skipping," he said. Because tripping only burns so many calories?