Joseph Baena is ready to pump you up just like his famous dad.
Arnold Schwarzenegger’s 29-year-old son made his Professional Natural Bodybuilding Association pro debut Friday, impressively placing fifth in the Classic Physique Open category.
Baena shared video of him showing off his insanely toned physique at the competition in El Segundo, California, striking poses for the judges in nothing but a pair of black underwear.
He captioned the footage on Instagram, “First look at my posing routine from the PNBA World Cup 🏆.”
He gave credit to the song he used, noting it was “The Trio” (from the 1966 Clint Eastwood classic “The Good The Bad & The Ugly”) by Italian composer Ennio Morricone.
He also shared video on Saturday praising his experience competing at the “fantastic” event.
“I’m extremely proud of myself,” he said of placing fifth. “This is my first year competing.”
“I achieved the goal I sought out for, ” he added. “I know what I need to improve. I know what it takes to get better now.”
In March, Baena posted pics of him training with his dad. He captioned the father-son pics at the gym, “You have to shock the muscles!”
He’s clearly following in his father’s footsteps, winning his first bodybuilding competition that month. He won first place in multiple categories at the NPC Natural Colorado State competition, including the Men’s Open Bodybuilding Heavy Weight Class, Men’s Classic Physique True Novice and Men’s Classic Physique Novice.
The following month he came in first place at the International Natural Bodybuilding Association’s (INBA) Iron Gladiator competition in Corona, California.
As for Schwarzenegger, 79, he famously won seven Mr. Olympia titles and five Mr. Universe titles.
The former action star shares Baena with his former housekeeper Mildred Baena.
He has four other children, whom he shares with his ex-wife, Maria Shriver: sons Patrick, 33, and Christopher, 29, and daughters Katherine, 36, and Christina, 35.
In May 2023, a source who knows Schwarzenegger told Page Six that while he and Baena “are very close,” his children with Shriver don’t have much of a relationship with their half-sibling.
“But, to be honest, the other kids don’t love Joe,” the source said. “It’s a shame as he’s a really good kid, and Arnold has always treated him like all his other kids — very fairly. But for whatever reason, the other kids take [the affair] out on Joe.”

