Before becoming a Hollywood megastar (and a somewhat questionable politician), Arnold Schwarzenegger was the world's most famous body builder.
Schwarzenegger was in Madrid last weekend to help host the 'Arnold Classic' bodybuilding event and was asked what he thought of Ronaldo's six pack.
"Cristiano Ronaldo has a fantastic physique. He has some great abs and he looks spectacular. He's in great shape and he's obviously a great football player.
"I don't really think Cristiano Ronaldo will ever be interested in competing at the Mr. Olympia event.
"He is quite simply focused and interested in being the best football player in the world, just the same way I was only interested in winning the Mr. Olympia title in the past.
"These are two completely different sports, but I have no doubts that Ronaldo is in great shape!"
Arnie himself showed he was in good nick recently, especially when you consider he is now 66, when he swapped poses with world heavyweight champion Wladimir Klitschko on Twitter.
Klitschko first posted a picture of himself mocking a famous Arnie pose with the message "Trying to catch u since I'm 12," to which Arnie replied "Right back at you."
— Klitschko (@Klitschko) September 5, 2013