It eliminates pressure on the spine
Most of the pressure to the spine is as a result of gravity. The neutral position which a person reaches when at zero gravity removes this pressure from the spine. Instead of having the pressure concentrated at the spine and vertebrae, it is distributed to the rest of the body.
Better neck and lower back massage
The distribution of the pressure on the spine to the rest of the body helps the neck and lower back to relax. Such relaxation makes it possible for the neck and lower back to be better massaged. These two areas are especially problematic for people with back problems. Making it possible for them to be properly massaged leads to relieved pain.
Better Lung Function
The extremely reclined position that is required for the zero-gravity posture to be achieved positions the lungs for optimum function. This ensures that for the duration of the massage the body is supplied with sufficient oxygen.