An apparatus for exercising the lower limbs of the human body, wherein a reciprocating movement is transmitted from a motor unit to a pair of supports on which the feet of a user rest, wherein the apparatus comprises: - a closed compartment incorporating grease which houses the motor unit, seated on a rubber seat plate secured to the base of the apparatus, a drive shaft of which is defined by a worm gear that engages with a gear wheel which is joined eccentrically by means of a shaft to one end of a first rod which, on the other end is joined, able to rotate, at one end of a second rod which, in turn, on the other end, is securely joined to one end of a third rod which, on the other end, is joined to one end of a fourth rod which, on the other end is secured to an arm from a pair of arms able to rotate about a central shaft and both arms of the pair being secured by securing shafts, which are located at the ends, to respective supports wherein, - each of the supports has a first hub which houses the central shaft with the interposition of a pair of first radial bearings and which is seated on a first axial bearing seated on a first radial projection located in one end of the central shaft, end which is extended with a threaded segment which crosses through a seat and is secured by means of a nut, the seat being secured to the base of the apparatus; - each end of each arm has a second hub which houses a securing shaft with the interposition of a second radial bearing and which is seated on a second axial bearing seated on the upper base of a second radial projection of the securing shaft which lower base is seated on the corresponding arm and the securing shaft is extended crossing through the arm in a threaded segment and is secured by an additional nut; wherein, - the second hubs of the pair of arms and the first hubs of the pair of supports have an internal setback whereon respective retaining washers (18, 26) are seated together with elastic rings (17, 25), securing the securing shafts and the central shafts. - a closed compartment incorporating grease which houses the motor unit, seated on a rubber seat plate secured to the base of the apparatus, a drive shaft of which is defined by a worm gear that engages with a gear wheel which is joined eccentrically by means of a shaft to one end of a first rod which, on the other end is joined, able to rotate, at one end of a second rod which, in turn, on the other end, is securely joined to one end of a third rod which, on the other end, is joined to one end of a fourth rod which, on the other end is secured to an arm from a pair of arms able to rotate about a central shaft and both arms of the pair being secured by securing shafts, which are located at the ends, to respective supports wherein, - each of the supports has a first hub which houses the central shaft with the interposition of a pair of first radial bearings and which is seated on a first axial bearing seated on a first radial projection located in one end of the central shaft, end which is extended with a threaded segment which crosses through a seat and is secured by means of a nut, the seat being secured to the base of the apparatus; - each end of each arm has a second hub which houses a securing shaft with the interposition of a second radial bearing and which is seated on a second axial bearing seated on the upper base of a second radial projection of the securing shaft which lower base is seated on the corresponding arm and the securing shaft is extended crossing through the arm in a threaded segment and is secured by an additional nut; wherein, - the second hubs of the pair of arms and the first hubs of the pair of supports have an internal setback whereon respective retaining washers (18, 26) are seated together with elastic rings (17, 25), securing the securing shafts and the central shafts.