Arnold Schwarzenegger and Dolph Lundgren pump iron together at Gold’s Gym in Venice Beach

Bodybuilders turning 80, action stars Dolph Lundgren and Arnold Schwarzenegger rocked sweats to lift weights together at Gold’s Gym in Venice Beach on Thursday.

At 75, the Austrian-born former California governor is a decade older than the cerebral Swede, who was a Marine and studied chemical engineering at MIT.

Multiple cameramen captured all the action inside the fenced-in outdoor area of ​​the legendary 58-year-old gym where memberships are $100 a month.

Perhaps Dolph and Arnold, both with little microphones, were collaborating on a fitness special or documentary.

Gold’s Gym was also enjoyed Thursday by Schwarzenegger’s youngest son, Dancing with the Stars #31 alum Joseph Baena, who took a selfie in the mirror with his friends from Pepperdine University, Dylan Hagen and Jonathan Lauer.

The seven-time Mr. Olympia secretly fathered his 25-year-old son with housekeeper Mildred ‘Patty’ Baena, effectively destroying his 25-year marriage to Emmy-winning producer and journalist Maria Shriver.

Arnold and Lundgren have only starred in three films together: The Expendables trilogy (2010, 2012, and 2014), which grossed a total of $804 million at the worldwide box office.

The Rocky IV alum will reprise his role as the newly sobered Gunner Jensen in Scott Waugh’s fourth and final $100 million-budget film, The Expendables, set to open in US theaters. US and UK on September 22.

Raid alumnus Iko Uwais will play the main villain, a ‘former military officer turned arms dealer with his own private army’ who gets involved in a nuclear conflict between Russia and the United States.

The Expendables 4 will also star Sylvester Stallone, Jason Statham, Andy Garcia, Curtis ’50 Cent’ Jackson, Megan Fox, Randy Couture, Tony Jaa, Jacob Scipio, Levy Tran, Sheila Shah, and Eddie Hall.

‘It’s definitely bigger. I mean, the budget is probably at least double what it was last time, I think,” Dolph said. popculture.com last year.

“It’s a special franchise, because a lot of these current action franchises are based on superheroes and are for young audiences. So there is no blood. Nobody dies. People are banished to another universe… But the Expendables is old school. Unfortunately, people blow up and shoot, and there are real fights and real stunts.

‘So I think with that kind of focus, plus the fact that we have… You know, Megan Fox is on it, 50 Cent is on it. He and I have many scenes together. Andy Garcia. There’s some new blood, and I think there’s some excitement to it, testosterone-fuelled excitement that hopefully people will want to see.

Brain and strength! At 75, the Austrian-born former California governor (left) is a decade older than the brainy Swede (right), who was a Marine and studied chemical engineering at MIT.

Action! Multiple cameramen captured all the action inside the fenced-in outdoor area of ​​the legendary 58-year-old gym where memberships are $100 a month.

What could they be filming? Maybe Dolph and Arnold, both with little microphones, were collaborating on a fitness special or documentary.

‘Bomb squad!’ Also enjoying Gold’s Gym on Thursday was Schwarzenegger’s youngest son Joseph Baena (M), Dancing with the Stars #31 alumnus, who took a mirror selfie with his Pepperdine University friends Dylan Hagen (L) and Jonathan Lauer (R).

But audiences can see Lundgren as Anders opposite Luke Wilson in Shane Dax Taylor’s terrorist wedding thriller The Best Man, which hits US theaters April 21.

Meanwhile, Schwarzenegger will next play CIA agent Luke in Nick Santora’s eight-episode father-daughter spy series FUBAR (F***ed Up Beyond All Repair/Recognition), which premieres May 25 on Netflix.

FUBAR will also feature Monica Barbaro, Jay Baruchel, Fortune Feimster, Gabriel Luna, Scott Thompson, Adam Pally and Tom Arnold.

‘Old School’ Action! The seven-time Mr. Olympia (5-R) and Lundgren (R) have only acted together in three films: The Expendables trilogy (2010, 2012 and 2014), which grossed a total of $804 million at the worldwide box office.

Hitting US/UK theaters on September 22! The Rocky IV alum will reprise his role as the recently sober Gunner Jensen in Scott Waugh’s fourth and final $100 million film.

Arriving in US theaters on April 21! But audiences get to see Dolph as Anders opposite Luke Wilson (L) in Shane Dax Taylor’s terrorist wedding thriller The Best Man.

Premiere May 25 on Netflix! Arnie will next play CIA agent Luke in Nick Santora’s eight-episode father-daughter spy series FUBAR (pictured with Monica Barbaro)