Aarón Hernández killed his best friend when he was at the peak of his sports career. He suffered from severe neurological deterioration due to blows in matches.

Former Real Madrid player Raphaël Varane said in an interview that he has suffered concussions when hitting a header in his sporting career. The player has reported this to open this debate, so that the damage to health from repeated blows is taken into account and measures are taken. In the case of the four families whose children died before the age of 25 with severe brain damage, they let their children play the sport again.