Fatal Nitrogen Leak at Paris Gym During Cryotherapy Session Kills Employee, Injures Client

A gym employee has died and a client remains in critical condition following a nitrogen leak at an 11th arrondissement fitness center, prompting an investigation into safety protocols.

The incident occurred Monday evening at the On Air gym in Paris, where a nitrogen leak during a cryotherapy session led to the death of a 29-year-old employee and left a 34-year-old client in critical condition.
Emergency services evacuated approximately 150 people from the gym, and three individuals who attempted to provide first aid were treated for minor injuries.
Authorities have launched an investigation to determine the cause of the leak, with initial findings suggesting oxygen displacement from nitrogen gas as the likely cause of asphyxiation.
The gym has been closed indefinitely, and officials are conducting autopsies and toxicology tests as part of their inquiry into the tragedy.
The incident has reignited concerns about the safety and medical validity of cryotherapy, a popular yet controversial treatment that uses extreme cold for muscle recovery and stress relief.