Jimmy Fallon, Dwayne Johnson show off aerobics skills on "The Tonight Show"

Dwayne "The Rock" Johnson and Jimmy Fallon appear as a pair of workout instructors on an episode of "The Tonight Show Starring Jimmy Fallon" on July 22, 2014, in New York.


Jimmy Fallon and Dwayne Johnson want to pump you up.

The late-night host and the "Hercules" star totally got into the spirit of the 1980s Tuesday night in a pair of aerobics sketches on "The Tonight Show."

Fallon and Johnson pretended to be The Fungo Brothers -- tube sock-clad siblings who apparently were using the Thighmaster, or the "Thighcruncher" as they call it, before everyone else.

"You'll know it's working when you feel the burn between your legs," Johnson explained, as the audience howled. Fallon didn't have quite as much success.

"I'm cramping up," the funnyman said.

Later on, Fallon pulled up another clip of The Fungo Brothers, this time as they were feeling the burn while dancing to Chubby Checker's 1960 classic, "The Twist."

The pair also made more than a few double entendres about the oft-parodied Shake-Weight device, as seen in the below video.

"Hercules" opens in theaters on Friday.

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    Ken Lombardi is an entertainment reporter for CBS News. He has interviewed over 300 celebrities, including Clint Eastwood, Oprah Winfrey and Tom Hanks.