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Cristiano Ronaldo regularly shares pictures where he is seen enjoying his downtime, but his most recent photo caught some eagle-eyed fans by surprise.

The former Manchester United and Real Madrid shared a picture of himself in a sauna as he recovers from his excursions with Saudi side Al-Nassr.

Typically, the picture showed off his incredible physique as he sits with his hands grasped looking thoughtful in the image shared on Instagram.

But fans noticed something unusual in that his toenails were painted black, with one fan replying to Ronaldo's post: 'Did I miss something or everyone else missed it. Did Ronaldo paint his toe nails?'

There is a good reason as to why he does this and it's for the same reason why many top athletes such as MMA fighters also paint their nails.