This habit of the Portuguese superstar is said to help him protect his toenails and limit nail fungus when regularly wearing shoes.

Sharing moments with his wife and children swimming in a villa in Saudi Arabia, C. Ronaldo revealed black painted toenails. However, according to Brightside, this is not the first time the Portuguese superstar painted his nails. From 2010 until now, occasionally the striker born in 1985 has been spotted painting his toenails black, which is said to help make toenails harder, limiting breakage, cracking, and popping of nails during intense physical activity.

Besides, applying a layer of nail polish is also said to help strikers prevent nail fungus and bacteria when the nature of their work requires them to regularly wear covered shoes.

Not only CR7, many professional athletes and martial artists also paint their nails as a way to protect their fingernails or feet from impact during training.

Nowadays, many people are still surprised when men paint their fingernails and toenails, however, according to Brightside, this practice has been around for a long time. Since the Babylonian civilization, men dyed their nails with minerals before entering battles to show rank and intimidate enemies. Ancient Egyptian men also painted their nails to distinguish their position in society; the darker the color, the higher their status.