COGNICURRENT

Bent Rønnestad has resigned from his position at Olympiatoppen amidst controversy related to a height mask sold to the late Sivert Bakken.

The tragic death of Norwegian biathlete Sivert Bakken has sparked debates over the safety and purpose of altitude training masks that he was wearing when found dead.

Real Madrid players have been spotted training with unusual blue masks that are used for simulating high-altitude training, designed by fitness coach Antonio Pintus for performance testing purposes.