A father and son who work out together, stay together!

Arnold Schwarzenegger is celebrating his 72nd birthday by spending time with his family. This week, his sons Patrick Schwarzenegger and Joseph Baena gave a sweet tribute to their dad.

“BIG happy birthday to the best training partner in the world! Love you dad 🎊🎉,” Joseph wrote in a photo of them working out.

Patrick also shared a photo of himself and his siblings, sisters Katherine, 29, and Christina, 28, and brother Christopher, 21, surrounding their dad with a birthday cake.

Happy Birthday, Arnold!