Why so many people have a hunchback when they are old?
It is related to our long-standing traditional concept that We generally believe people should sleep on hardboard when growing during child time, which is good for children's bone growth and development.
A traditional innerspring mattress, or open coil, has a network of metal coils that are all connected. This means that when pressure is applied, the springs all react together. This transfers motion, so if your partner moves you’ll feel it.Additionally, because the coils all move together, traditional innerspring mattresses provide less comfort and don’t spring back as easily. They also don’t contour around your body as much as a pocket coil mattress.