The present invention effectively causes a seated user to perform a shape-up exercise having the objectives of the strengthening of bodily abilities, the maintaining of a lean body type, and the like. The chair (1) for shaping up is provided with: a seat (2) on which the user (U) sits a support (7) that has a downwardly bulging curved surface disposed below the seat (2) and that supports the seat (2) by means of at least the apex of the curved surface contacting the floor an airbag that presses the user (U) seated at the seat (2) and a fall-preventing section (13) that suppresses the seat (2) from tilting at or above a predetermined tilt angle to the rear.使就座之使用者,有效進行以肉體能力的強化或維持瘦身體型等為目的之塑形運動。本發明的塑形用椅子(1),具備:供使用者(U)就座的座部(2)、及配備於座部(2)下側的支撐部(7),其具有朝下方膨起的曲面,並且以該曲面的至少頂部與地板面接觸並支撐座部(2)、及用以推壓就座於座部(2)的使用者(U)之氣囊、以及抑制座部(2)朝向後方傾斜動作時所產生的角度達到預定斜度以上的翻倒防止部(13)。1‧‧‧塑形用椅子2‧‧‧座部3‧‧‧扶手部4‧‧‧靠背部7‧‧‧支撐部13‧‧‧翻倒防止部U‧‧‧使用者
