The 'Terminator' is currently in Spain and admits he admires the former Manchester United ace's physique.
"He has a fantastic physique and great abs. He's in amazing shape. That's why he's such a great footballer," he said.
"I don't think he's interested in competing in Mr Olympia. Ronaldo wants to be the best player in the world and what I wanted was to win the Mr Olympia title. They're two very different sports."
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