Arnold Schwarzenegger's son must have learned from his old man -- you gotta get the cardio in if you wanna get ripped.
Joseph Baena wrapped up a workout session Friday with a run on the beach in Malibu ... along with a couple buddies who popped their shirts off to show off their muscles too.
This isn't the first time Joseph's shown he's a chip off the old block either. What can we say ... he gets it directly from his dad.
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