An exercise chair includes a base including a back support set that can support the curve of the back of the human body and a design that the buttocks can sit on the rotary seat. A pedal is pivotally connected to the support bracket of the base and is located at the rotation. The lower position of the seat is provided for the user to step on, and the movable pivoting seat is arranged at the middle of the back bracket group to control the rotation angle of the back bracket group, and the two elastic stretching members are respectively located between the back bracket group and the support bracket. The two sides are configured to drive the back bracket group to rotate through the movable pivot joint and normally perform the up and down reciprocating displacement operation. A telescopic support base is pivotally connected to the movable pivot joint, and can be adjusted according to the shape or weight of the user. The height of the support point is used for the back stretching movement of different strengths, and the setting of the backward tilting angle avoids the risk of backward folding.一種運動椅 ，其包括一基座，其包含符合人體背部曲線可支撐的背部支架組以及臀部可坐在旋轉座椅上的設計，一踏板樞接於基座的支撐固定架上，且位於旋轉座椅之下方位置以提供使用者踩踏，一活動樞接座設於背部支架組的中段處，係控制背部支架組的旋轉角度，二彈性拉伸件分別位於背部支架組與支撐固定架間的兩側，以驅使背部支架組透過活動樞接座的旋轉並常態性地進行上下往復位移運作，一伸縮支撐座樞接於活動樞接座上，能夠根據使用者的身型或體重以伸縮調整支撐點的高度，來進行不同強度的背部拉伸運動，且具有後傾角度的設限，可避免向後翻覆的危險。
