To work herself into an adrenaline-fueled zone of concentration at the recent Sunday competition, she paced behind the lifting area, with heavy metal blasting on her headphones.

“I hate it — I only listen to it before I lift,” said Naomi, who approaches the bar with yells, growls, staccato breathing and pumping arms. It is an unexpected preparatory ritual from a teenage girl who spends her weekdays studying the Talmud.

Naomi often competes alongside her 14-year-old brother, Ari, and their father, Ed Kutin, both of whom are also accomplished lifters. Her mother, Neshama, assumes the role of manager. During the recent competition, Ms. Kutin cheered on her family and joked about her superstrong children shirking chores.

“They’re lifting in the 300- to 350-pound range, but you should be there when I ask them to carry in the packages,” she said.

In truth, she said, they are helpful. Years ago, Naomi helped with the groceries by carrying a 60-pound bag of dog food out of the supermarket. A bystander called it too heavy a load for a child.

“I told him, ‘We’re fine, you have no idea who she is,’” Ms. Kutin recalled.

As a child, Naomi was a standout in karate and could beat the local boys at push-ups and other strength exercises. Her father, a longtime powerlifter, asked her to join his lifting workouts.

“She said, ‘I thought you’d never ask me,’” Ms. Kutin recalled.

The family ran it by their rabbi, since it is an unconventional activity for Orthodox girls. And then Naomi was off and lifting.