What is Zero Gravity?
The term "Zero Gravity" has to do with the recline position the chair can assume. Zero Gravity position mimics the posture astronauts take during liftoff on space missions. Because astronauts endure intense and sudden increases in gravity while escaping the Earth's gravitational pull, it's important that they position themselves so that their bodies can deal with the increase in stress. By assuming a reclined position, astronauts distribute the stresses of takeoff across their bodies in a safe way. To that end, the chairs astronauts sit in during launch use this reclined configuration.
Zero Gravity massage chairs can assume the same position to help distribute a user's weight across the chair. This relieves stress on the body and allows for a deeper, more intense massage experience. The reduction of stress on your body is so effective you'll feel virtually weightless as a result!
One benefit of this position is that it promotes circulation in the legs and reduces swelling. Elevating the legs over the level of the heart during rest can help prevent conditions like varicose veins.