On Thursday, the five-time Ballon d’Or winner shared a picture of him and 13-year-old son Cristiano Jr showing off their physiques after a gym session.
The post on Instagram accrued more than 15 million likes but not for the first time, plenty of people picked up on Ronaldo having nail polish on his toenails.
It happened previously when he shared a snap of him recovering in the sauna and there were comments such as, “Why bro got black toe nails?” and “Is no one going to talk about the black painted nails?”.
But Ronaldo does not paint his toenails black for aesthetics as there is a genuine purpose for him doing so.
The polish effectively creates a protective layer and hardens the toenails, stopping them from being cracked.
It’s common in sports, particularly with track athletes and boxing and MMA fighters.
Heavyweight legend Mike Tyson is believed to have painted his nails in the peak of his boxing career.
And former UFC middleweight champion Israel Adesanya is also onboard.