The sofa is too soft. What's the trick?
Sofa pad is too soft, the weight of the body's support instability, it will intentionally or unintentionally move the body to seek new balance, and therefore a long time to sit soft sofa pad will make people feel backache.
At the same time, sitting on a soft sofa pad, the spine is difficult to maintain normal physiological curvature, and over time, will cause abnormal tension back muscles, causing low back pain. Under normal circumstances, people sit down, the sofa cushion to sag, about 1 cm is appropriate. In the elderly, the body and bones are younger than the younger ones, and more rigid ones should be selected.
