Kim Kardashian relaxes in a red light therapy bed. Chris Hemsworth can’t stop cold plunging. And Gwyneth Paltrow loves ...

A gym employee in Paris was killed and a customer was left in critical condition during a cryotherapy session gone wrong.

French police said the women collapsed after a suspected nitrogen leak from a cold chamber that had been repaired earlier in the day on April 14. Cryotherapy treatments involve exposing the body ...