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StressStress can physically affect your whole body. Back pain is the body's way of communicating a stress overload and a need for slowing down. Tension and stress literally become a "pain in the neck" or a "pain in your back." Muscle tension Poor posture can lead to chronic muscle tension. This is a common ailment among computer and factory workers. Stress and tension create substantial back problems. They can cause muscle spasms in the neck and shoulders, as well as headaches. Tense muscles produce pain by reducing the supply of oxygen, blood, and lymph flow, allowing the accumulation of waste chemicals, such as carbon dioxide and lactic acids. Stress induces extra nerve activity to muscles, creating undue tension, and decreasing your flexibility. Muscle tension can actually be measured by monitoring electromyographic (EMG) activity. Technicians place sensors on particular muscle groups and attach them to a small machine which detects tension. The tenser the muscles are, the faster the signal emitted by the machine, and the greater the risk for pain and injury. 
Inversion can help Inverting for just a few minutes can help relax tense muscles. A study conducted by physiotherapist LJ Nose found that "EMG activity declined over 35% within ten seconds of inversion." Inversion, therefore, is very effective in relieving muscle tension and pain which may have been caused by stress. The concept of inverting the body for better health has been practiced for centuries. In yoga, the "Shirsonana" head stand position has been used as a form of "postural exchange." Not everyone wants to do headstands, though, so inversion products create an easier alternative for achieving the same effects. Additionally, suspension by the thighs or ankles decompresses strained and overworked muscles, whereas a head stand is harmfully compressive to the spine. Summary
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