Despite his age, Cristiano Ronaldo is unquestionably one of the best athletes in his field.

LeBron James, Lewis Hamilton, Thiago Silva, and Eliud Kipchoge are just a few athletes who have managed to keep their fitness levels at their highest peaks alongside Ronaldo.

It comes as no surprise that the majority of his accomplishments occurred after he turned 30.

Ronaldo has hit the ground running in Saudi Arabia, as he aims to win the league title in his maiden season with Al-Nassr.

Age always has a funny way of catching up with a person and one has to devise ways to remain at an optimum level. For the 38-year-old, hitting the gym constantly has always done the trick.

However, fans noticed something else when Ronaldo recently uploaded a picture of himself in the sauna on his Instagram story. Hawk-eyed followers spotted the five-time Ballon d'Or winner had his toenails painted black.

Upon a quick glance at his social media pages, where his toenails are often visible, it was established this was not a one-time coincidence: the veteran regularly has his toenails painted.

Why Ronaldo paints toenails black

It has already been determined, this is likely not for aesthetic reasons. Black toenails are a phenomenon often seen with MMA fighters or boxers including the legendary Mike Tyson at one point.

The main idea behind the paint to prevent chipping of toenails while they are training or on the pitch, as Black Belt Trek reports.

German publication, BILD additionally adds that 'many top athletes do this to protect their nails from fungi and bacteria when they are stuck in sweaty shoes for hours'.

There is no doubt the Portuguese icon has taken several initiatives to ensure his longevity.

At this rate, he might have at least five more years in the tank, before he called it quits on an illustrious career that has taken him to the top in five countries.

Why Argentine turned down Al-Nassr

It was earlier reported that Ricardo Antonio Mohamed opening up about his decision not to take up the head coach role at Ronaldo's Al-Nassr.

The Saudi Pro League side axed Rudi Garcia recently on the back of a poor run of form and replaced him for now with U19 coach, Dinko Jelicic on an interim basis.

Mohamed, who currently manages UNAM Pumas in Mexico, claimed he turned down an opportunity to coach Al-Nassr despite four attempts made by the club.