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Nicole Kidman<\/a> left a lasting impression on her co-star <\/span>Joey King<\/a>\u2026 and her buns. King, 24, who plays Kidman’s daughter in the new Netflix film, <\/span>A Family Affair<\/em><\/a>, spoke about Kidman’s impact on her fitness routine during an appearance on <\/span>The Tonight Show Starring Jimmy Fallon<\/em><\/a> on Monday night.\u00a0<\/span><\/p>\n “She taught me the most epic, awful butt workout I’ve ever learned in my life. It was, like, so intense,” King said of Kidman, 57. “I was like, ‘I’m a youngster. I can hang. I’m young, and I’m agile.’ I thought I could hang, but I couldn’t hang.”\u00a0<\/span><\/p>\n As for the workout that did King in, she shared, “It was these donkey kicks and the rainbows and the fire hydrants and all these other [moves]. But you have to keep your leg in the air for, like, 12 years. It’s so hard.”<\/span><\/p>\n Even though filming wrapped on the comedy, King said that she still practices the workout.\u00a0<\/span><\/p>\n “I do it still because it’s the most effective workout, so I send her photos when I do it. I’m like, ‘Call an ambulance, love you!'” King quipped.\u00a0<\/span><\/p>\n King called the Oscar winner “just a sweet and silly, fun person,” adding, “She’s such a girl’s girl.”<\/span><\/p>\n The two starred alongside Zac Efron in the film where King plays Efron’s assistant.\u00a0<\/span><\/p>\n “Her and Zac too, they’re both, like, so hot,” she added of Kidman and Efron. “They’re so hot. They’re the fittest people I’ve ever met. So I became a bit of a tubular gym rat on the set.”<\/span><\/p>\n As for the <\/span>High School Musica<\/span><\/em>l alum’s contribution to King’s fitness regimen, she noted, “He was also, again, so fit, and he helped teach me about my protein intake. He’s very helpful with the wellness tips.”\u00a0<\/span><\/p>\n