PROBLEM TO BE SOLVED: To allow a seated user to effectively perform a shape-up exercise for the purpose of strengthening physical capacity and maintaining a slim body.SOLUTION: A chair 1 for shape-up of this invention includes: a seat part 2 for a user U to be seated a support part 7 which is arranged below the seat part 2, which has a curve surface swollen downward and which supports the seat part 2 by being in contact with a floor surface at least at an apex of the curve surface an airbag which presses the user U seated in the seat part 2 and a fall prevention part 13 which stops the seat part 2 from tilting at equal to or more than a predetermined tilting angle backward.COPYRIGHT: (C)2014,JPO&INPIT【課題】着座した使用者に、肉体の能力の強化や痩身体型の維持などを目的としたシェイプアップ運動を効果的に行わせる。【解決手段】本発明のシェイプアップ用の椅子1は、使用者Uが着座する座部2と、座部2の下側に配備され、且つ下方に向かって膨らんだ曲面を有すると共にこの曲面の少なくとも頂部で床面に接触して座部2を支持する支持部7と、座部2に着座した使用者Uを押圧するエアバッグと、座部2が後方に向かって所定の傾動角度以上に傾動すること抑制する転倒防止部13と、を備えている。【選択図】図3