Lenox Fit President Suzanne Merritt sits in an infrared sauna used in tandem with a cryotherapy machine. A typical 30-minute cryotherapy session at her Lenox fitness center begins with polar immersion ...

Justin Linn stands next to the Mecotec cryotherapy chamber at his office, Linn Family Chiropractic. The device, which Linn recently added to his therapeutic toolbox, reaches temperatures as low as ...

In 2009, the year the first cryotherapy machine landed in the U.S., the country boasted more than 18,000 tanning salons. A decade later, that number had fallen below 8,000.