Arnold Schwarzenegger's son Joseph Baena appeared to be on cloud nine over the weekend, and for good reason - the 28-year-old had just topped the podium at his first bodybuilding competition. Baena was spotted taking a casual stroll shirtless through Los Angeles, flaunting his toned physique and giving fans a glimpse of why he earned first place. Joseph Baena's post-competition walk Arnold Schwarzenegger's son Joseph Baena was seen for the first time since winning his debut bodybuilding competition.