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Infrared Heating therapy
Far infrared light is the frequency of invisible light that is naturally generated by the sun. FIR therapy is a type of low energy therapy that uses the heat generated by energy waves from the other end of the infrared spectrum. This safe and natural alternative therapy can be used to treat a variety of health conditions, such as arthritis, muscle pain and cramps, and stiffness in the shoulders or joints.
According to a Pain Research And Management mentioned that Infrared therapy can be effective in reducing chronic low back pain, with no side effects. 
Infrared therapy can be used in many different ways like they are using it in infrared saunas, infrared heating pads and many other things. 
FIR therapy also benefits the body:
Help the body eliminate toxins through perspiration
Improved lymphatic flow
Increased blood circulation in deep tissue
. Webpage: Infrared therapy for chronic low back pain. Available https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2539004/#__ffn_sectitle
. Webpage: A Helpful Guide to the Best infrared heating pads. Available: https://www.drugsbanks.com/best-infrared-heating-pads-pain/