Arnold Schwarzenegger ‘s son, Joseph Baena, often exhibits his strong physique. But can he crack an egg with his bicep? A video on his stories on social media shows “it’s harder than it looks.” The 22-year-old took to his account to post a video captioned, ”challenge accepted,” that begins with the actor-athlete warming up with a few pull-ups on a bar mounted on his door frame before he attempts to crack an egg with his bicep.