A reformer exercise apparatus has a generally rectangular frame and a pair of spaced-apart parallel tracks or rails joining a head end and a foot end. A movable carriage is mounted on the frame for movement of the carriage along the rails. A pair of spaced-apart anchor bar supports formed integrally with the tracks is fastened near the foot end of the frame and each supports an end of a nonrotating spring anchor bar. Each bar support has a series of upwardly open slanted slots, and the anchor bar is received in a selected pair of the slots. The cross section of each anchor bar end is shaped to engage the slot walls to prevent rotation of the anchor bar.