Arnold Schwarzenegger's son dominates bodybuilding debut with multiple first-place wins

The "Terminator" star's son, Joseph Baena, walked home a winner Saturday after earning first place in a handful of categories at the drug-free, NPC Natural Colorado State competition.

Baena, 28, took home first place in the Men's Open Bodybuilding Heavy Weight Class, Men's Classic Physique True Novice, and the Men's Classic Physique Novice, and earned second place in the Men's Classic Physique Open Class C.

"Tanned up and checked in! Ready for tomorrow's show," Baena wrote in a carousel of behind-the-scenes images.

He thanked his friends and family for the sweet messages, but admitted there was still work to be done.

"Time to do it again on Saturday," he wrote over a flexing image from the stage in Colorado. 

The event, which is a national qualifier, is also part of the NPC natural athlete pathway to the Olympia.

WATCH: ARNOLD SCHWARZENEGGER TRAINS LOOKALIKE SON JOSEPH BAENA AT GYM AS BODYBUILDING BUZZ GROWS

Schwarzenegger's representatives did not immediately respond to Fox News Digital's request for comment.

"You have to shock the muscles!" he captioned a snap with his famous bodybuilder father.

In a video obtained by Fox News Digital, Schwarzenegger carefully adjusted Baena's positioning to ensure optimal muscle growth.

Baena has been carving out his own path - from acting roles, including the 2024 action thriller "Gunner," to landing a Men's Health cover - while navigating inevitable comparisons to his father.

"It's been a huge growth year of me finding out who I am and really being secure … confident … no matter what the challenges are, what the comparisons are," Baena previously told Fox News Digital.

Baena added, "The message that I wanted to get across was, there's a lot of people out there with very accomplished parents … and it's scary. It's scary to get compared to these giants and to have the feeling like you need to live up to these expectations."