Sitting in a reclined position is better for your back health than sitting on a regular chair because the latter leads to unnatural postures that wear out the discs in the spine. To notice a reduction in muscle activity, you need to sit in a reclined position that starts between 110 and 130° and goes up to 180°. By doing so, you put less pressure on your spine and reduce the likelihood of discomfort and long-term spinal damage.