Infrared Heat penetrates several inches below the skins surface causing your core temperature to rise. This deep heat will flush toxins, reieve muscle soreness, enhance blood flow to the muscle and promote a feeling of relaxation. Infrared sauna therapy aids in burning calories and can relieve tension and stress.

According to the Journal of the American Medical Association, regular use of an infrared sauna imparts a similar stress on the cardiovascular system as that of running, and regular use may be as effective a means of cardiovascular conditioning and burning of calories as regular exercise.

Infrared heat therapy has been recommended to help treat arthritis, burcitis, lyme disease, high blood pressure, muscle and joint pain, sciatica and many other ailments 

Check out this article from Healthline.com discussing the benefits of infrared sauna therapy

https://www.healthline.com/health/infrared-sauna-benefits#2