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KAMI MINER STANDS in a makeshift gym in the garage of her family's Las Vegas home. Storage boxes line the back wall, and exercise gear -- a leg press machine, a treadmill, a cycle, ropes and dumbbells -- takes up the rest of the space. Her father points a camera at her.
"I'm about to do 30-inch box jumps," says Kami, a USA sticker on her right cheek.
"You're 10. And you're about to do 30-inch box jumps?