A high knees exercise apparatus includes a base, two actuator members, and two pedals. The base includes a supporting member and a pivot portion. The pivot portion has a pivot axis. The actuator members are pivotally connected to two sides of the pivot portion respectively and moving in response to each other reversely. Each of the actuator members includes a lower portion swinging along an arc path centered on the pivot axis. The arc path includes a first arc extended from a virtual vertical line passing through the pivot axis and an angle of the first arc is 45 degrees to 100 degrees. Each of the pedals is pivotally connected to a free end of each of the lower portions.