An exercise chair that is operable to engage a user's core muscle groups in order to maintain a desired position thereof. The exercise chair includes a base having a plurality of legs. A seat member is rotatably secured to the base. A first mounting plate is secured to the bottom of the seat member. A second mounting plate is secured to the first mounting plate. The second mounting plate is ring-shaped and undulated in form having at least two peak section and at least two valley sections. A wheel assembly is superposed the base and includes wheels configured to engage the second mounting plate and traverse therealong. A mount having a shaft coupled thereto rotatably couples the seat member with the base. In a first position of the exercise chair, the wheels of the wheel assembly are engaged with the at least two peak sections.