“I thought I could hang.

But I couldn’t hang.”

“They’re the nicest people.

Nicole Kidman and Joey King

Nicole Kidman and Joey King.Gilbert Flores/Variety/Getty

And Nicole especially is such a sweet and silly, fun person.

She’s such a girls' girl.”

King added that she was particularly impressed by Kidman and Efron’s athletic physiques.

Joey King and Nicole Kidman in ‘A Family Affair’

Joey King and Nicole Kidman in ‘A Family Affair’.Tina Rowden/Netflix

“They’re both so hot,” she observed.

“They’re like the fittest people I’ve ever met.

Gilbert Flores/Variety/Getty

The actress went on to explain how Kidman transformed her workout routine.

“Nicole was the one who taught me,” King said.

and I was like, ‘We’re in jeans!’

But she taught me the most epic, awful butt workout I’ve ever learned in my life.”

In fact, she struggled to keep up with Kidman’s fitness regimen.

“It was so intense,” King said.

“And I was like, ‘I’m a youngster, I can hang.

I’m young, I’m agile.’

I thought I could hang.

But I couldn’t hang.

It’s so hard.

It was so insane.”

TheKissing Boothstar said that she still employs the routine.

“I do it still, because it’s the most effective workout,” King said.

Love you.'"

Tina Rowden/Netflix

“I would sing [High School Musical] on set,” she recalled.

“And he would sing along with me.

And he was, again, so fit.

He helped teach me about my protein intake.

He’s very helpful with the wellness tips, like, ‘What’s your plasma like?'”

A Family Affairis now streaming on Netflix.

Watch the full conversation between King andJimmy Fallonabove.