Joseph Baena and Sergio Oliva Jr. Post Gym Photo After Training Together

"The Next Generation!" Baena wrote in the caption. "Wishing my brother the best of luck as he trains for @arnoldsports!"

While the two bodybuilders appear to be great friends, their fathers were famous rivals. Baena's father, of course, is the Austrian Oak-turned-Governator himself, Arnold Schwarzenegger , who won Mr. Universe at the age of 20 and took home the title of Mr. Olympia no fewer than seven times. Oliva's father and namesake was a three-time Mr Olympia, and the only man to ever beat Schwarzenegger to that title, which he did in 1969.

"I understood why they called him the Myth,'" Schwarzenegger wrote in his 1977 memoir. "It was as jarring as if I'd walked into a wall. He destroyed me. He was so huge, he was so fantastic, there was no way I could even think of beating him. I admitted my defeat and felt some of my pump go away. I tried."

It's far from the first time Baena has made a reference to his father's legacy in the sport. In addition to looking a hell of a lot like a young Arnold, he's recreated a handful of his dad's most iconic bodybuilder poses on Instagram before. The two also work out regularly together , with Baena calling him "the best training partner in the world."

Baena also uses his social media presence to share his gains , show off some of his favorite techniques , and encourage followers to push themselves in their own workouts. Although as of yet, he doesn't have his father's habit of correcting other people's form at the gym .