Gym Employee Dies, Client Fights for Life After Freak Accident

A wellness trend once hailed as cutting-edge turned deadly in Paris Monday evening, as a 29-year-old gym worker was killed and a client critically injured in a cryotherapy chamber malfunction — the latest tragedy in a string of warnings about this controversial treatment.

The incident occurred at the On Air gym on Boulevard Voltaire, one of the trendy, upscale fitness centers now popular across Europe. Just before 6:30 p.m., emergency services rushed to the facility after a suspected nitrogen leak overwhelmed the air supply in a cryotherapy suite.

Authorities say liquid nitrogen — used to cool the chamber to temperatures as low as minus 230 degrees Fahrenheit — likely displaced the oxygen in the room. Both women collapsed and went into cardiac arrest within seconds. The employee was pronounced dead on-site. The 34-year-old client remains hospitalized in critical condition, reportedly “between life and death.”

Three others who tried to administer aid were also hospitalized with breathing difficulties.

“This was an avoidable tragedy,” a fire official at the scene told local media. “People think they’re stepping into a wellness pod — they don’t realize they’re playing with industrial-grade chemicals that can kill in under a minute.”

The gym was immediately shut down and is now the focus of an active criminal investigation. The Paris prosecutor’s office confirmed that an autopsy and toxicology tests are underway to determine the precise cause of death. Investigators are also reviewing the ventilation systems and nitrogen handling protocols.

Cryotherapy, once considered a fringe therapy, has exploded in popularity across Western Europe and parts of the U.S. in recent years. Promoted by celebrities and wellness influencers, the procedure involves exposing the body to frigid air for short bursts, allegedly to reduce inflammation, accelerate recovery, and burn fat.

But experts have long raised red flags.

“This is not just cold air,” said Dr. Alan Royce, an occupational health expert in Dallas. “We’re talking about cryogenic gas capable of suffocating a room in seconds. These facilities should be regulated like industrial labs, not luxury spas.”

In fact, the European Industrial Gases Association has issued repeated warnings about the use of nitrogen in public settings, citing the extreme risk of “oxygen displacement and sudden asphyxiation.” The U.S. Occupational Safety and Health Administration (OSHA) has also flagged nitrogen as a silent killer when not used with proper safety equipment.

Tragically, this is not the first fatality linked to cryotherapy. In 2015, 24-year-old Las Vegas spa manager Chelsea Ake-Salvacion was found frozen solid in a chamber after reportedly entering it alone after hours. That death prompted calls for tighter oversight in the U.S., but little has changed globally.

For many conservative Americans watching from afar, this incident is yet another grim reminder of what happens when regulation takes a backseat to profit and so-called “science-based wellness.”

“Europe is pushing these fads with little regard for real safety,” said former FDA adviser and medical ethics commentator Dr. Lisa McHenry. “Meanwhile, Americans are being sold the same snake oil in strip mall spas with TikTok ads and celebrity endorsements. Where’s the accountability?”

Cryotherapy has been championed by athletes, Hollywood elites, and biohackers alike. But critics say the real science doesn’t support the hype — and the dangers are being dangerously downplayed. Even the Mayo Clinic has warned that simple ice packs or cold-water plunges may offer similar benefits with far fewer risks.

As the Paris case unfolds, it raises serious questions about the global wellness industry and whether cutting-edge treatments are worth the cost — or the lives.

The On Air gym has not commented on the incident.