Fitness has never looked so sexy!

Dwayne "The Rock" Johnson stopped by "The Tonight Show" to chat with Jimmy Fallon about his new movie "Hercules" -- but instead of talking about the action flick, the two re-created one hilarious '80s fitness video.

Check out the funny clip above!

While talking about his fitness regimen for the movie, The Rock said he drew inspiration by watching some of his old workout tapes.

Fallon decided to pull out a clip from the NBC "archives" ... which featured the twosome dressed up in '80s workout gear, instructing one ridiculous routine.

Going by the name of The Fungo Brothers, each star rocked a shaggy wig and muscle T-shirt for the silly skit.

"You know it's working when you feel the burn between your legs," explained Johnson. "You gotta hustle for the muscle!"

Love it -- what do you think about Fallon and Johnson's workout skit? Tell toofab in the comment section below!

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