Abstract: An exercise apparatus comprises a movable carriage having a generally flat top surface, the carriage being movably mounted on parallel track members of a frame having a head end and a foot end, the carriage having a pair of shoulder stops mounted thereto and plurality of elastic members connected between the foot end and the carriage to elastically bias the carriage toward the foot end of the frame. The apparatus has a movable spring anchor bar and carriage stop assembly comprising an anchor bar with at least one elongated stop member arranged perpendicular to and secured to the anchor bar, the stop member having a carriage stop surface located towards the end of the stop member remote from the anchor bar and the stop member further comprising at least one movable means of engagement with the frame of the exercise apparatus. The anchor bar and stop assembly may easily be moved and readjusted one handed with safety and smooth operation.