Tevez played with the former Real Madrid star at United.
He recalled: "With Cristiano for me, and what no doubt all the women have seen, is that he spends the whole day in the gym! (Laughter)
"It's an obsession for him, he spends all day in the gym. And being the best at everything… We didn't even start training at 9am, you'd get there at 8am and the madman would be there! You'd get there at 7:30am and he was already there!
"I'm like, what the f*** do you have to do for him not to be there? One day I go there at 6am… and the dude's there! Come on buddy!"