Zero gravity was originally introduced by NASA a couple of decades ago as a way to reduce stress on the body of astronauts being launched into space by utilizing the concept of relative gravity. In this position your legs are raised to the level of your heart and gravity's influence is placed on the front of your body instead of the top, which allows your joints and spine to decompress. In astronauts, this position was used to help them combat the extreme g-force exerted on their bodies while they were being launched into space.
In a massage chair, this position is designed to help relax you so that you get the most out of your massage experience. The extra relaxation allows the massage rollers to provide a much deeper benefit to your muscles. Many massage chairs have multiple stages of zero gravity, usually up to two. The second stage just being further reclined which provides a number of benefits itself.
The second stage of zero gravity focuses the majority of your body weight on the backrest which helps your back massage rollers dig further into your muscles without the chair having to work any harder. The second stage improves almost all aspects of your massage simply be placing you in an incredibly comfortable position. We have included all of our massage chairs the provide zero gravity functionality in one place. Check out our Zero Gravity Massage Chairs.