The present invention provides an isometric exercise in which a user is seated on a seat board and regularly uses learning or work while regularly pushing the body toward the user and continuously supporting the body on the body support plate, This is a chair for the idiopathic vertebrae, which are used for the early prevention and corrective treatment of idiopathic vertebrae, According to the present invention, there is provided a seat assembly comprising: a seat plate for providing a seating space; A support for supporting the seat plate at a predetermined height; A backrest support formed to stand upright behind the seat plate; And a backrest supported by the backrest support, On both sides of the seat plate, a body support body which is elastically tilted inwardly of the body support plate is arranged symmetrically, A user who is seated on the seat plate moves the body side portion to the left or right side where the body support body is formed and performs an isometric exercise to support the body that has been moved to the body on an elastic tilted body support plate .
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