If you're reading this now, it means you've made up your mind that out of all the many features of massage chairs - roller tracks, heating, 3d technology, and so on - zero gravity is one of your top priorities. choosing the best massager for you depends on your primary needs. The zero-gravity feature is specifically ideal for people suffering from: • A bad back • Spinal conditions • Cervical spondylosis (neck arthritis) • Arthritis of the knees • Heart problems • Varicose veins • And other similar diseases that are compounded by gravity and body weight. One other really compelling reason that has people determining for massage chairs with the zero-G feature is the testimony of users that it's just like "floating on a cloud" or "gently drifting in the ocean". For the people who are dealing with a lot of stress, these soothing massage chair sessions are a much-needed respite. What is zero gravity technology? Anti-gravity technology was initiated by (no surprise) NASA, for space traveler. If you've seen an astronaut during take-off, zero gravity chairs mimic this particular position of our space travelers. In this reclined position, astronauts are able to withstand the increasing force of gravity during take-off. Moreover, in a study of the human body in space, dimensions recorded by NASA scientists showed that the most comfortable and stress-free state of the body is when it is in a trunk-to-thigh angle of 128 degrees. These findings and data were combined into massage chair technology so that today, we have massage chairs that can be reclined up to a point that your feet are on the same level or elevated higher than your heart. Zero gravity technology is one of the more exciting features in the massage chairs that are currently in the market.