The Scene From 'Hercules' That Made Dwayne 'The Rock' Johnson Black Out 8 Times

Check out the video of The Rock struggling with real steel chains.

— -- There's not much Dwayne "The Rock" Johnson can't handle.

But, when the 42-year-old movie star and former wrestler filmed "Hercules," he had trouble with one scene.

Read: Dwayne 'The Rock' Johnson Describes His 'Absolute Worst Time'

"I asked the prop department to lock me in with real steel chains that I couldn't break, so the performance would be real," Johnson posted along with a video on Instagram. "When HERCULES finally accepts his fate of being the son of Zeus, it's THE epic moment of the mythology -- and our movie."

He added, "We shot this scene 8 times -- I blacked out every time. Down to my knees. Well worth the fun pain.. this moment is iconic. Im excited for you to see it... #HercDontLikeBlackingOut #HappilyDoItAgain #HERCULESMovie"

In the video, you see The Rock struggle and struggle, screaming "I am Hercules," until he can't take anymore and his hands collapse on his knees. It's intense, check it out.