Transcript for Dwayne 'The Rock' Johnson's Gross Secret to 'Hercules' Hair

How lawyers -- eighteen -- you are paralleling herculean now. Yes -- why you laugh myself come on -- -- yeah. If that would have done -- system it's a process it's an experience. Every day every day by the way. Every day for. Five months every day three and a half hours it takes three and a half hours every morning so I get up at 330 and train. And then I would go and that I would E*Trade again present to train twice for the role. And -- or go sit and hair make up for three and a half hours for the transformation we have these -- me you love them by the way. -- amazing Italian. -- designers all Oscar nominated three and a half hour. I'm telling you -- -- was looking out of the looking for this -- you couldn't see it it was a brilliant very notoriety. I'm very good at detecting the system neighborhood know who is good but I look -- If they had driven up how could you dislike slept and it woke up the nickname but -- I don't know about what it done that -- Good. It's just it's. They did put too much time and again into the wigs you you just can't and into the beard and by the way I gotta say that the -- -- this is crazy and the beard wasn't lace. So -- had to be put on strips cut. In time. Quarter inch wide. Piece by piece and so I asked my -- designers -- -- -- what what what does this mean goes oh is that I have to maniac. Another. I hit by the way with a very expensive and very fine Ernesto that -- actually goes yes the acting he's putting it on my face here and that's what -- what part he goes. The testicles calling. It's been -- this yeah okay. The hardest -- him back here. The good old -- testicle -- the -- -- -- you know everybody -- that in. The Pentagon. Hundreds of which I will go to yes. We are proud of being -- yeah.

This transcript has been automatically generated and may not be 100% accurate.