what should you look for in a seat? 

 1 
 Is it too soft?
A very soft seat, like a very soft mattress, does not give enough support.
 2 
 Is it too deep? Seats should not be deeper than the length of the average thigh. Your buttocks should be at the back so that you can get support without having to slump.
 3 
 The angle between the back and the seat should be close to a right angle.
 4 
 Does the back force the spine into exaggerated forward or backward curves?
 5 
 is the seat a level surface without dips and bumps?

The work chair and the dining chair have special requirements. The seat should not be lower at the back than at the front.

A picture of a good chair?
There are hundreds of good chairs, and they do not all look alike!

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