Why is back support provided in an ergonomic chair?

Correct answer: To support the spine properly

Ergonomics applies knowledge of the human body to the design of furniture, tools, and workspaces. An ergonomic chair is designed to keep the body comfortable and supported during sitting. Its back support helps hold the spine in a natural position, reduces unnecessary strain on the back muscles, and encourages better posture. Good support is especially useful when a person sits for study or work for a long time. The chair should also suit the user’s body and allow the feet and legs to remain comfortably positioned.

Option B is correct because proper back support supports the spine and helps maintain a healthy sitting posture. Option A is incorrect because decoration is not the main purpose of ergonomic design. Option C is incorrect because making a chair heavy does not improve body support. Option D is the opposite of ergonomics, whose aim is to make work and sitting safer, easier, and more comfortable. Thus, the design feature has a health and comfort purpose.