Abstract: A seat for training legs contains: a frame and a sitting assembly mounted on the frame. A sliding unit is fixed between the frame and the sitting assembly and includes a sliding rack and a sliding block, the sliding rack includes a slidable rail arranged on an upper surface thereof and a fitting tube mounted on two sides of the frame, the sliding block is disposed on a back surface of the sitting assembly and connects with the slidable rail. A vertical moving unit is defined between the frame and a rear end of the sliding rack to drive the rear end of the sliding rack to move obliquely. A foot support is mounted on a front end of the frame to support user's feet. Thereby, the user's feet are placed on the foot support to exert force so that the sitting assembly slides to exercise the user's feet.