Arnold Schwarzenegger's 'secret son' Joseph Baena is following in his father's bodybuilding footsteps.The 23-year-old lovechild of Arnie, whose father had an affair with a housekeeper while married, let his fans in on the dramatic transformation is currently undergoing on Instagram.Joseph showed off his sculpted torso and flexed his biceps for the camera after whipping off his shirt at the gym.He then takes on an iconic bodybuilding pose by holding his wrist with one hand and flexing his bicep towards the camera.In the clip, Joseph begins by wearing a tank top that emphasises his hulk-like body as he lifts a pair of 50lb bar bells.His incredible physique and muscles move during the epic workout.Eventually, he puts the weights down and peels.
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