Gymnastic machine comprising a base structure having a front transmission assembly and a rear transmission assembly, wherein said base structure comprises two lateral longitudinal members (27, 28) between which a sliding belt slides, a sliding belt, associated to said base structure, on which a user can perform a gymnastic exercise, wherein said sliding belt is configured to rotate by means of said front transmission assembly and said rear transmission assembly according to a sliding direction, wherein said sliding belt is arranged between said two lateral longitudinal members (27, 28) and an electric motor, having at least a stator and at least a rotor (31, 31', 32), said electric motor (3, 3') being kinematically coupled to said front transmission assembly, or to said rear transmission assembly, for moving said sliding belt, said at least one stator, comprises a plurality of electric coils, said said gymnastic machine being characterized in that said electric motor (3, 3') is of axial flow type, the magnetic field flow being directed parallel with respect to the axis of the motor, in that said electric motor comprises a drive shaft rotatably coupled to said stator, in that said electric motor comprises a first rotor (31, 31'), provided with a plurality of permanent magnets (31 a, 31 b,..., 31 n), keyed to said drive shaft, and a second rotor, provided with a plurality of permanent magnets (32 a, 32 b,..., 32 n), keyed to said drive shaft,and in that said sliding belt comprises a plurality of slats flanked one following another according to a transversal direction to the sliding direction of said sliding belt and hinged to one another, wherein said stator is directly or indirectly fixed to one of said lateral longitudinal members, and wherein said stator is arranged between said first rotor (31, 31') and second rotor. a base structure having a front transmission assembly and a rear transmission assembly, wherein said base structure comprises two lateral longitudinal members (27, 28) between which a sliding belt slides, a sliding belt, associated to said base structure, on which a user can perform a gymnastic exercise, wherein said sliding belt is configured to rotate by means of said front transmission assembly and said rear transmission assembly according to a sliding direction, wherein said sliding belt is arranged between said two lateral longitudinal members (27, 28) and an electric motor, having at least a stator and at least a rotor (31, 31', 32), said electric motor (3, 3') being kinematically coupled to said front transmission assembly, or to said rear transmission assembly, for moving said sliding belt, said at least one stator, comprises a plurality of electric coils, said said gymnastic machine being characterized in that said electric motor (3, 3') is of axial flow type, the magnetic field flow being directed parallel with respect to the axis of the motor, in that said electric motor comprises a drive shaft rotatably coupled to said stator, in that said electric motor comprises a first rotor (31, 31'), provided with a plurality of permanent magnets (31 a, 31 b,..., 31 n), keyed to said drive shaft, and a second rotor, provided with a plurality of permanent magnets (32 a, 32 b,..., 32 n), keyed to said drive shaft,and in that said sliding belt comprises a plurality of slats flanked one following another according to a transversal direction to the sliding direction of said sliding belt and hinged to one another, wherein said stator is directly or indirectly fixed to one of said lateral longitudinal members, and wherein said stator is arranged between said first rotor (31, 31') and second rotor.