There were no easy days for Charlize Theron making the Netflix survival thriller “Apex.” Ask her what was the hairiest scene she pulled off and she just laughs.

“This wasn't one of those [films] normally like, ‘So I got to do this one thing that was crazy,’” the Oscar winner recalls. “Every day I did something that was totally insane in the best way possible.”

Theron stars in Baltasar Kormákur’s “Apex” (streaming now on Netflix) as Sasha, a grieving rock climber who’s traveled to Australia to find peace amid Mother Nature after the loss of a loved one. Instead of solace, she finds a serial killer: Charismatic local Ben (Taron Egerton) seems like a helpful sort, but turns out to be a sinister dude who hunts her through the wilds of a national park.

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Sasha gets put through the physical wringer, as did Theron. On just the fourth day of filming, she free-jumped 30 feet off a cliff into 6 feet of water at Ginninderra Falls near Canberra.