Most zero gravity chairs are designed to be set in a variety of positions. Users can recline at several angles, sit upright to work, or even lean forward to focus on various projects. In all of these positions, the settings of the chair are intended to support the weight of the body, reducing pressure on the spine and ribcage and keeping the sitter in a state of comfort. By reducing pressure on the body, the chair can also be helpful for people with back pain or other physical discomfort.
A zero gravity chair is a highly adjustable chair that is designed to support the human body extremely well, creating a sense of weightlessness and comfort. As with other pieces of ergonomic and specially designed furniture, it must be carefully adjusted to be effective, and it is possible for the chair to be poorly adjusted, resulting in discomfort to the sitter.
I can attest to the comfort of sitting in it with back pain. I reclined all the way back in it so my legs were higher then the rest of me. It gave me SO much relief in my hips.