taught his love child, , the tricks of his trade as he prepared for his first bodybuilding competition.
The seven-time Mr Olympia, 78, joined his son, 28, in the gym as they were seen perfecting one of Arnold's signature moves.
After a session of pumping iron at the gym, Joseph was seen shirtless, flexing his bulging biceps, as his father attempted to correct his form.
Arnold looked worlds away from his Mr Olympia heyday as he was seen wearing a black T-shirt, shorts and knee-high socks.
They perfected each shape as they gained a crowd at Gold's Gym in Venice, .
Joseph is set to make his bodybuilding debut at NPC Natural State, which will be held at Pinnacle Performing Arts Centre in Denver, CO.
Arnold Schwarzenegger taught his love child, Joseph Baena , the tricks of his trade as he prepared for his first bodybuilding competition
The seven-time Mr Olympia joined his nepo baby son in the gym as they were seen perfecting one of Arnold's signature moves (pictured in 1970)
Every athlete who enters this show will not only be drug tested, but they'll also take a 30-minute polygraph test to ensure they haven't taken any performance enhancers.
On March 18, half-Guatemalan athlete Joseph - who boasts nearly one million social media followers - revealed he packed on 18lbs of muscle in eight weeks.
'He's an amazing father. He's a great person to look up to, and he's the smartest man I know,' Joseph told ET in 2023.
'It's been a great journey and he's always been so supportive of whatever I do. So, I'm just really grateful to have a dad like him.'
And in 2022, while the Christie's real estate agent was competing in Dancing with the Stars, Arnold marvelled, 'Jesus Christ, I can't even believe that you can move like that' because as he told ET, 'our family's not known for dancing, especially on my dad's side.'
Indeed, out of all five of the former California Governor's children, Joseph has followed in his footsteps the most, despite primarily growing up with his chef mother, Mildred 'Patty' Baena, in Bakersfield, CA.
The Pepperdine University grad was only 13 in 2011 when Arnold revealed he secretly fathered him during a 'one-night stand' with his former housekeeper, which ended his 25-year marriage to journalist Maria Shriver before their divorce was finalised in 2021.
Last year, Maria admitted in her poetry book I Am Maria that the divorce 'broke my heart, it broke my spirit, it broke what was left of me.
'Without my marriage, my parents, a job, the dam of my lifelong capital-D Denial just blew apart.'
Joseph and the FUBAR producer-star first bonded over fitness, and he gifted him a copy of The Encyclopedia of Modern Bodybuilding, which he co-authored in 1985.
'My dad is old-school; he doesn't believe in handouts. He believes hard work pays off, and so do I,' the Dog Patrol: Operation Santa Paws actor told Men's Health in 2022.
'I love the word honour, and I'm very prideful in the sense that if I use my dad's contacts or ask him for favours, I wonder what honour is that gonna bring me?'
Arnold has five children: Katherine, Christina, Patrick, and Christopher with his ex-wife Maria Shriver, and Joseph with Mildred.
After a session of pumping iron at the gym, Joseph was seen shirtless, flexing his bulging biceps, as his father attempted to correct his form
Arnold looked worlds away from his Mr Olympia heyday as he was seen wearing a black T-shirt, shorts and knee-high socks
Joseph is set to make his bodybuilding debut at NPC Natural Colorado State, which will be held at Pinnacle Performing Arts Center in Denver, CO
