First of all, ergonomic chairs are not designed to be the most comfortable seat, but to maintain the right lumbar curve so that you feel uncomfortable when you sit in a bad position and return to normal posture.
The most comfortable, in theory should be a sofa, the sofa of the general will be very soft, fall among them will feel very comfortable, this is because in addition to the change of the posture, center of gravity of slow decline and fall of process a experience, at the same time, the package of support feeling, also can let you have been supporting muscles instantly relaxed and comfortable.
However, this change is very short-term, and after the failure of the support sense of the software, some muscle groups of the human body will be re-strained to maintain this unstable posture, causing new fatigue, so, sitting on the software sofa, it is difficult to maintain a posture for a long time, but also very easy to feel tired.
So any good chair or couch will be uncomfortable to sit on for a long time, but it's ok to sit on it for a short time.
About sofa, not too understanding, do not recommend.
Ergonomic chair, according to the description of the subject, you have to buy that kind of wide chair, such as Enjoy Yao S3A, bao You Jin Hao E this kind of chair, but the price is not cheap, two or three thousand yuan. The sofa?