In football, players do not wear jewelry such as necklaces or rings during competition or practice. Football cannot avoid collisions. Therefore, removing jewelry before going on the field is necessary to limit risks.

However, when he goes out to practice, Ronaldo always wears a black ring. Expert Jose Blesa – who is working at Al Nassr with Ronaldo – revealed that the ring above is an inseparable item for the Portuguese star when training.

In fact, the ring worn by Ronaldo during practice is not jewelry. It is a technology item developed by a company in Phan Lan. When worn, this ring will help measure heart rate, breathing rate, body temperature as well as movement.

The above parameters will be displayed in an accompanying application, from there, users will be able to evaluate sleep quality and performance of activities during the day. The data provided by the ring even supports early diagnosis of some respiratory diseases.

Ronaldo takes training very seriously. Therefore, he did not forget to bring a special ring to better evaluate this process. According to El Futbolero, the price of the ring is not expensive compared to Ronaldo’s budget, about 400 euros (more than 10 million VND).