What are infrared saunas and why do celebrities love them? Kim Kardashian, Lady Gaga, Selena Gomez, Gwyneth Paltrow and Jennifer Aniston are all fans of the wellness treatment trending on Instagram

• Using infrared light to heat a sauna means your body absorbs more heat directly and sweats out toxins more easily – but what are the risks you should know about?
• Lady Gaga swears by infrared sauna sessions to ease muscle spasms and pain caused by fibromyalgia, while Gwyneth Paltrow told Instagram she uses one every day