Abstract: Muscle stretching apparatus characterized in that it comprises a support structure (3) mounted so as to pivot on a frame (1) by means of a pin (2), this support (3) being provided with means (5.sub.1, 5.sub.2) for supporting the two legs of the user, these means being mounted on the support by means of pivot pins (4.sub.1, 4.sub.2, which are perpendicular to the pin (2) on which the support (3) pivots on the frame (1), this frame including a support platform of adjustable height, the arrangement of the three rotation pins (2, 4.sub.1 and 4.sub.2) making it possible to position the physiological joint axes of the individual in alignment with the pins of the machine, regardless of the movement performed and the morphology of the individual.