Arnold Schwarzenegger hits the weights with his son on his 22nd birthday (Video)

Usually having a birthday, staying out late celebrating is a worthy excuse for skipping the gym.

Not in the Schwarzenegger household. When your dad is a multiple Mr Olympia world champion bodybuilder, that reason won't cut it. Patrick Schwarzenegger went out late to celebrate turning 22, and thought he could wrangle a day off from the gains. https://twitter.com/PSchwarzenegger/status/644910079179751424 No chance. Terminator star Arnie dragged the lad down the down for a chest workout - and put him through his paces with 22 reps on the chest machine. He's not quite an muscle-bound action hero yet, but Patrick is in good shape. Even his dad admits it.

Happy birthday @PSchwarzenegger. I never thought I'd have a son who was stronger and smarter than me. pic.twitter.com/R3In67zaky

— Arnold (@Schwarzenegger) September 18, 2015