Abstract: A resistance motor for an exercise apparatus includes a housing and an internal gear unit. The housing includes a casing body and a casing cover coupled with the casing body to define a receiving cavity therewithin. The internal gear unit includes an output wheel operatively supported by the casing body, a worm gear, a first gear, a second gear, and a third gear. The worm gear, the first gear, the second gear, and the third gear are supported in the receiving cavity. The worm gear, the first gear, the second gear, the third gear, and the output wheel are operatively engaged in a sequent order. The output wheel, which has the largest diameter, is located above the second gear and the third gear, such that the position of the output wheel is higher than the positions of the second gear and the third gear.