Arnold Schwarzenegger's son Joseph Baena proves he is a full-fledged gym rat as he shares another workout image

Joseph Baena shared another image during a workout session on Thursday. In this one the LA native shows off his arm muscles as he sits in a machine.The son of Arnold Schwarzenegger often lifts weights at home or at Gold's Gym in Venice Beach, California. He had on a rust-colored top with a print of the front. His caption read, 'Alternating half and full reps.'In the background other gym goers could be seen.